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Removing and Replacing Broken LOB TB61 Outer Lock Cylinder: A Practical Guide

Mariuszek66 15558 17
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How can I open a LOB TB61 lock when the key and inside knob spin freely and the latch no longer moves?

Cut or drill the strike area where the latch enters, rather than the lock body, so you can free the bolt, open the door, and then replace the lock afterward [#16770426] [#16773439] [#16770466] If you want a less destructive option and the door is an older type, knock out the hinge pin/axle, lift the leaf off from the other side, and then unscrew the lock normally [#16773921] [#16774641] [#16774693] One reply also suggests first trying to remove the inside closing knob, since that may give access to the mechanism [#16770466] Another diagnosis was that the spring may have broken and the bolt dropped free, which would explain why turning the key or knob no longer moves the latch [#16784505]
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  • #1 16770267
    Mariuszek66
    Level 7  
    Posts: 20
    Rate: 4
    As in the subject, the key rotates over and over, but does not move the latch. Similarly, from the inside you can turn the knob, but it does not catch the latch. Apparently something inside got loose and fell off. It is a summer house in which we now enter the window in an emergency. How to open this lock so as not to destroy the door? After disassembly, I would replace it with an identical one after the old holes. Has anyone had a similar problem and managed it? I don't want to destroy the door.
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  • #2 16770320
    mistrzszymon1
    Level 24  
    Posts: 630
    Help: 59
    Rate: 94
    Drill or eraser. :)

    Added after 2 [minutes]:

    Two bolts moving the latch were broken. :)
  • #3 16770372
    Mariuszek66
    Level 7  
    Posts: 20
    Rate: 4
    mistrzszymon1 wrote:
    drill or eraser :)
    Added after 2 [minutes]:
    two bolts moving the latch were broken :)


    But how to drill?
  • #4 16770386
    Tommy82
    Level 41  
    Posts: 12139
    Help: 455
    Rate: 1070
    Or maybe you are just able to damage this part of the lock where the latch enters?
    How is the approach you will cut with flex,
    Then you open the door and disassemble the lock normally.
  • #5 16770426
    mistrzszymon1
    Level 24  
    Posts: 630
    Help: 59
    Rate: 94
    It is best, as a friend above, try to cut the part where the gate valve enters.
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  • #6 16770434
    Mariuszek66
    Level 7  
    Posts: 20
    Rate: 4
    mistrzszymon1 wrote:
    best is probably like a colleague above try to cut out the part where the bolt goes

    But then I won't be able to mount a new one in the same place.
  • #7 16770443
    mistrzszymon1
    Level 24  
    Posts: 630
    Help: 59
    Rate: 94
    Sure you will be able to, because the new one is a whole set.

    Added after 1 [minutes]:

    Removing and Replacing Broken LOB TB61 Outer Lock Cylinder: A Practical Guide
    I would probably cut it like that

    Added after 38 [seconds]:

    And new comes with new, I do not know if he writes well, but a staple. ")
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  • #8 16770466
    marekhab
    Level 33  
    Posts: 1349
    Help: 251
    Rate: 266
    I suggest you drill a hole in the element where the gate valve enters (from the front of the gate valve) maybe you can pull the gate through the hole.
    Have you tried removing the closing knob from the inside?
  • #9 16771955
    stomat
    Level 39  
    Posts: 5600
    Help: 255
    Rate: 1952
    But the door opens, looking at the drawing, to us or inside the drawing?
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  • #10 16772065
    Mariuszek66
    Level 7  
    Posts: 20
    Rate: 4
    marekhab wrote:
    I suggest you drill a hole in the element where the gate valve enters (from the front of the gate valve) maybe you can pull the gate through the hole.
    Have you tried removing the closing knob from the inside?


    I haven't been there yet, I will try to pull the knob, but I don't know if I will move the latch

    Added after 35 [seconds]:

    stomat wrote:
    But the door opens, looking at the drawing, to us or inside the drawing?

    to us, the left door
  • #11 16773439
    1repcaK
    Level 21  
    Posts: 401
    Help: 52
    Rate: 122
    With an angle grinder, I would cut off the tongue entering the staple.
  • #12 16773921
    bodziot
    Level 21  
    Posts: 400
    Help: 37
    Rate: 92
    If you have an older door, all you need to do is knock the axle out of the hinges, then you will be able to pull the door the other way and unscrew the lock normally
  • #13 16774600
    Mariuszek66
    Level 7  
    Posts: 20
    Rate: 4
    "you will knock out the hinges on the axle" - what exactly is it about? does it mean that they should be removed from the hinges from the inside even though they are closed on the latch?
  • #14 16774641
    stanislaw1954
    Level 43  
    Posts: 15002
    Help: 1981
    Rate: 4560
    Mariuszek66 wrote:
    what exactly is this about?
    In older hinges there were those that could be dismantled - just knocking out the bolt (axle) from the part embedded in the door frame and the part embedded in the door leaf.

    Added after 8 [minutes]:

    https://encrypted-tbn0.gstatic.com/images?q=t...6YnD6eVM8VI6KHqzhqHzI-S34ZnymFRg4gryv96xEKneQ This is an example.
  • #15 16774693
    1repcaK
    Level 21  
    Posts: 401
    Help: 52
    Rate: 122
    You do not remove from the hinges, because after breaking the axle they no longer exist. This process is reversible.
    It's best if someone helps you and pushes the door slightly from the other side.
    Condition - no security locks. These are the pins in the door leaf that go into the openings in the door frame when closing.
  • #16 16779098
    Mariuszek66
    Level 7  
    Posts: 20
    Rate: 4
    I haven't used an angle grinder yet, I wonder if it can't drill through the latch case and then after drilling a few holes in the case, try to pull the latch out? I have a drill and sometimes I use it :) although I would have to buy a metal drill bit. Is a 510 W power drill good for metal like this case? what diameter drill bit would be most appropriate here?
  • #17 16779126
    stanislaw1954
    Level 43  
    Posts: 15002
    Help: 1981
    Rate: 4560
    The power of the drill is not very big, but it will manage. It's best to buy a set of drills from thin 1.2 mm to e.g. 10mm. firstly drill several holes e.g. ?5 close to each other, and then drill them with e.g. ?8 drill until a larger hole is created

    Added after 7 [minutes]:

    Or maybe take a picture of this door from the inside and show it in the forum. Perhaps there is another way to get to this lock.
  • #18 16784505
    stomat
    Level 39  
    Posts: 5600
    Help: 255
    Rate: 1952
    A little bit more and someone will propose dynamite. After all, it's just a latch, not Fort Knox. If it does not go to open from any side, then probably the spring (red arrow) has broken and this vibration dropped, which means that the bolt should be able to move freely. Just for information, the castle was opening turning in which direction?
    Removing and Replacing Broken LOB TB61 Outer Lock Cylinder: A Practical Guide
    I suggest "attacking" this tab on the back of the zipper (blue arrow), slightly bend the zipper and undo the bolt with a hook.
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Topic summary

✨ The discussion revolves around the issue of a broken LOB TB61 outer lock cylinder, where the key rotates without engaging the latch. Users suggest various methods to open the lock without damaging the door, including drilling, cutting, and removing the knob. Some recommend drilling holes in the latch case to pull it out, while others propose cutting the latch entry point. There are also suggestions to remove the door hinges if they are older models, allowing access to the lock. The conversation emphasizes caution to avoid permanent damage to the door and the importance of using appropriate tools, such as a drill with metal bits, for the task.
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FAQ

TL;DR: If your LOB TB61 outer cylinder/knob spins but won’t retract the latch, a 510 W drill "will manage" to drill out the latch case; start with small bits and step up. [Elektroda, stanislaw1954, post #16779126]

Why it matters: This FAQ shows DIYers how to open and restore a jammed TB61 without destroying the door, fast.

Quick-Facts

Quick Facts

How do I open a TB61 when the key and knob just spin?

Create access at the latch face, then retract the bolt manually. Drill a small pilot hole in the case, enlarge it, and hook or pull the latch back through the hole to open. This avoids door destruction when the internal linkage has failed. [Elektroda, marekhab, post #16770466]

Is drilling really enough power-wise for this job?

Yes. A 510 W corded drill is adequate for thin lock-case steel. Start with small bits and step up to enlarge the opening. As one expert noted, “The power of the drill ... will manage.” [Elektroda, stanislaw1954, post #16779126]

What drill bit sizes should I use to access the latch?

Use a set from about 1.2–10 mm. Make several 5 mm holes close together, then open them with an 8 mm bit to form one access port for a hook or pick. [Elektroda, stanislaw1954, post #16779126]

Can I just cut the strike plate or latch with an angle grinder?

Yes. Cutting the tongue at the strike (staple) with an angle grinder frees the door. It’s fast but creates sparks and requires care to protect the frame. Replace the strike afterward with the new set. [Elektroda, 1repcaK, post #16773439]

Will cutting the strike prevent fitting a new lock in the same place?

No. The replacement lockset includes a new strike/“staple,” so you can reinstall hardware in the same footprint after opening the door. [Elektroda, mistrzszymon1, post #16770443]

Could the problem be broken internal bolts?

Yes. A common failure is the two internal bolts that move the latch shearing off, causing free-spinning keys and knobs. “Two bolts moving the latch were broken.” [Elektroda, mistrzszymon1, post #16770320]

What’s a quick non-destructive trick from inside?

Remove the interior knob to expose the spindle area. If accessible, manipulate or pull the latch via the exposed mechanism without cutting. This can save the door and trim. [Elektroda, marekhab, post #16770466]

How can hinge pins help me open older doors?

On older, split-pin hinges, knock out the axle (pin) to separate leaf and frame. Push the door back from the hinge side, then unscrew and replace the lock normally. [Elektroda, stanislaw1954, post #16774641]

What’s the catch with removing hinge pins?

It only works if there are no security locks (anti-lift pins) in the door edge. These pins engage the frame holes and block removal even with the hinge pins out. [Elektroda, 1repcaK, post #16774693]

Does the door handing or swing affect my approach?

Yes. The discussed case is a left-hand door opening toward you. Plan drill access from the latch face and tool angles based on that swing to avoid collateral damage. [Elektroda, Mariuszek66, post #16772065]

Where exactly should I “attack” the latch if the spring failed?

Target the rear tab of the zipper/latch assembly through a created opening. Slightly bend the zipper and unhook the bolt with a hook tool. “Attack this tab ... and undo the bolt.” [Elektroda, stomat, post #16784505]

What is the strike plate (also called a “staple”)?

It’s the metal plate on the frame that the latch tongue enters. Cutting or replacing this plate is acceptable when opening a failed lock, since new sets include a replacement. [Elektroda, mistrzszymon1, post #16770443]

Can I damage only the latch area and keep the door intact?

Yes. Focus cutting or drilling on the latch case or strike zone. After opening, remove the lock normally and fit a new set using the existing door prep. [Elektroda, Tommy82, post #16770386]

What’s a minimal-tool, 3-step way to drill and open the door?

  1. Drill 3–4 pilot holes (~5 mm) close together in the latch case face.
  2. Enlarge to ~8 mm to form a single access port.
  3. Insert a hook/pick to pull the latch back and open. [Elektroda, stanislaw1954, post #16779126]

Is using “dynamite” force necessary here?

No. This is a latch, not a vault. If the spring dropped, the bolt often moves freely once you reach the rear tab and lever it. Precision beats brute force. [Elektroda, stomat, post #16784505]

Why do the key and knob spin without catching?

Internal components have come loose or broken, decoupling the cylinder/knob from the latch. That’s why the latch won’t retract despite rotation. [Elektroda, Mariuszek66, post #16770267]
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