Blitzwolf BW-MO2 mouse button interior cleaning and replacement

p.kaczmarek2 15 Jan 2024 12:08 3 2253 Cool? (+4)

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TL;DR

Blitzwolf BW-MO2 wireless mouse controls two computers with a bottom switch and ships with two receivers, one USB Type-C and one regular USB.
Inside, the shell uses one bottom screw and clips, and the board carries the laser sensor plus a main controller marked MA60H383.
The plastic parts, wheel, and PCB were cleaned, with the wheel scrubbed by toothbrush and the circuit washed in IPA alcohol.
The left button responded once in 3 attempts, so a replacement switch and improvised plastic spacer restored the mouse to like-new operation.
No matching button was available, so the fix used whatever part was on hand and a cut plastic footrest.

BW-MO2 is a wireless mouse that is distinguished by the ability to control two computers, this control is switched by a small button on the bottom of the mouse. This mouse simply has two receivers - one for USB Type-C and the other for regular USB. This is very handy for me, as it allows me to operate two machines in the workshop at the same time, without installing solutions such as Barrier, Synergy or Mouse Without Borders.
Unfortunately, the mouse recently rebelled - so I had to look inside it and cleaned it on occasion. I invite you to a short photo gallery of the process.

Interior and cleaning of BW-MO2
There is only one screw on the bottom, on the other side holds the catch:

This is how you get inside:

Beyond the dust pulled in by the mouse wheel, we also see the laser sensor and the main mouse controller: MA60H383

The board is held in place only by clips, and can be levered:

Similarly with the side buttons:

I separated the plastic and cleaned it decently:

The wheel was also very dirty:

But it was also washed:

PCB I washed with IPA alcohol:

Unfortunately, the left mouse button continued to respond once in 3 attempts. I decided to replace it:

I didn't have such a button (or a matching one), and the mouse was needed "right away" so I cut the footrest out of plastic and soldered what I had:

After one fix and a few resizing, it worked. The mouse works like new.

Summary
This was a temporary solution that so far has stayed for the long term and so far has worked flawlessly. It's certainly better to fix the mouse this way than to throw it away, especially since one stock button and a little solder joint doesn't cost much anyway. In addition, the mouse is now practically like new - and the dirtiest thing was probably the wheel, which I also managed to clean decently with a toothbrush. I hope that the mouse will serve me a little longer.

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p.kaczmarek2 wrote 14649 posts with rating 12660 , helped 655 times. Been with us since 2014 year.

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FAQ

TL;DR: For users fixing a Blitzwolf BW-MO2, this repair is simple: remove 1 screw, release 1 clip, clean the wheel and PCB, and replace the weak left switch if it works only "once in 3 attempts." It solves missed clicks, double-click faults, and workshop two-PC control without extra software. [#20910500]

Why it matters: A cheap switch swap and careful cleaning can restore a useful dual-receiver mouse instead of sending it to waste.

Option	Controls	Switching method	Extra setup
Blitzwolf BW-MO2	2 computers	Small bottom button	Two included receivers, no software install
Barrier / Synergy / Mouse Without Borders	2 computers	Software-based	Installation required

Key insight: Cleaning helps when dirt blocks the wheel and PCB area, but a left button that still fails after cleaning usually needs a microswitch replacement, not more washing. [#20910500]

Quick Facts

The BW-MO2 is a wireless mouse built for 2 computers and uses 2 receivers: one USB Type-C and one standard USB receiver. [#20910500]
Disassembly starts from the bottom with 1 screw; the opposite side is held by a catch, and the main board is retained by clips instead of additional screws. [#20910500]
The reported left-click fault was severe: the button responded only once every 3 presses even after cleaning, which led to switch replacement. [#20910500]
One user had replaced about 10 buttons across different mice, and another bought 5 silent switches on AliExpress for only a few złotys. [#20927537]
An older A4tech mouse from about 2005 was restored with an Omron switch and small plastic repairs instead of being discarded. [#20913595]

How do you open the Blitzwolf BW-MO2 mouse for cleaning without breaking the bottom clip or catch?

Open it from the bottom by removing the single screw first, then release the catch on the opposite side gently. Do not pry both sides at once. 1. Remove the 1 bottom screw. 2. Lift the shell from the screw side. 3. Unhook the opposite catch carefully. The thread shows only 1 screw and 1 retaining catch, so force is unnecessary and increases the risk of snapping the plastic. [#20910500]

What is the safest way to clean the inside of a BW-MO2 mouse, especially the wheel, PCB, and laser sensor area?

Clean it by separating the plastic parts, washing the dirty wheel carefully, and wiping the PCB with IPA alcohol. Use a soft brush on dust-heavy areas. The wheel was the dirtiest part in the repair, and the PCB was cleaned with IPA after disassembly. Keep liquid away from parts you cannot dry fully, especially around the sensor opening and wheel mechanism. [#20910500]

Why does a mouse left button start responding only once every few clicks, and how can you tell whether cleaning or switch replacement is needed?

It usually means the microswitch has worn out, not just become dirty. In the BW-MO2 case, cleaning did not fix a left button that worked only once in 3 attempts, so replacement was necessary. Test after cleaning: if the wheel dirt is gone but clicks still fail repeatedly, the switch itself is the likely fault. A separate user also fixed erratic clicking by replacing the old button with an Omron switch. [#20910500]

How can you replace the left-click microswitch in a Blitzwolf BW-MO2 when you do not have the exact original button in stock?

You can fit a non-identical switch temporarily by adapting the plastic support and resizing as needed. The repair used a switch that was not an exact match, then cut the plastic footrest and soldered in the available part. After one correction and a few resizing steps, the mouse worked like new. This is a practical stopgap when the mouse is needed immediately. [#20910500]

What kind of replacement switch fits the quiet mouse buttons used in models like the Blitzwolf BW-MO2 or Logitech M330 Silent?

A quiet low-noise switch of the same general style can fit, but pin length matters. One user reported the same quiet button style in a Logitech M330 Silent and bought 5 replacements on AliExpress for a few złotys. In that case, the wheel-position switch needed the version with the longer protruding pin, while earlier repairs used a short-pin silent switch. [#20927537]

Why can a failing mouse button look like a computer virus, such as random double clicks or rectangles being drawn on the desktop?

A bad switch can send extra or stuck click signals, which makes normal desktop actions look malicious. One user thought a virus was involved before realizing the aged left button was sending two pulses from one press. Another report described a supposed “virus” that drew rectangles on the desktop, but the mouse was the real fault. Hardware click errors can mimic software problems very convincingly. [#20913616]

What troubleshooting steps help confirm whether strange cursor behavior is caused by the mouse hardware rather than software or malware?

Swap the mouse first and compare behavior before blaming software. That is the fastest test mentioned in the thread. If the strange clicks, drags, or rectangles disappear with another mouse, the hardware is at fault. One user initially scanned for malware, but the root cause was an old left button sending two pulses per click. This check saves time and avoids unnecessary software diagnosis. [#20913595]

Which works better for controlling two computers in a workshop: a dual-receiver mouse like the Blitzwolf BW-MO2 or software like Barrier, Synergy, or Mouse Without Borders?

A dual-receiver mouse works better when you want instant hardware switching without installing software. The BW-MO2 can control 2 machines using 2 receivers, switched by a small button on the bottom. The author found that especially handy in a workshop because it avoided installing Barrier, Synergy, or Mouse Without Borders. Software still works, but the thread presents the hardware method as simpler for that use case. [#20910500]

What is IPA alcohol, and why is it commonly used for cleaning mouse PCBs and electronics?

“IPA alcohol” is isopropyl alcohol, a cleaning solvent that removes dirt and residue from electronics, evaporates quickly, and leaves little moisture behind. In the BW-MO2 repair, the PCB was washed with IPA after the plastic parts and wheel were separated. That makes it a practical choice for board cleaning during mouse refurbishment. [#20910500]

What is the MA60H383 chip inside the BW-MO2 mouse, and what role does it play in the mouse operation?

The MA60H383 is the main mouse controller identified on the BW-MO2 board. “MA60H383” is a mouse control IC that handles the device’s core electronic functions, acting as the main controller on the PCB and coordinating button, sensor, and interface behavior. The thread names it directly when showing the opened mouse interior next to the laser sensor. [#20910500]

How do side-button and main-board clips in a mouse typically come apart during disassembly, and what should you watch out for?

They usually release by careful levering, not by removing more screws. In the BW-MO2, the board is held only by clips, and the side-button assembly comes apart similarly. Watch the clip direction and do not bend the PCB hard, because the thread shows clipped retention rather than screw retention. If you force the wrong edge, you risk cracking plastic tabs or stressing the board. [#20910500]

What causes mouse wheels to collect so much dirt, and what cleaning method works best without damaging the encoder or plastic parts?

Mouse wheels collect dirt because they pull in dust during normal handling and scrolling. In this case, the wheel area was the dirtiest part of the mouse. The effective method was simple: remove the wheel during teardown, wash it separately, and scrub it with a toothbrush. Clean the surrounding area without flooding the mechanism, then dry the wheel before reassembly. That restores feel without replacing parts. [#20910500]

How do quiet mouse switches differ from classic clicking Omron switches in feel, noise, and replacement compatibility?

Quiet switches are much less audible, while classic Omron switches give a stronger click feel and sound. The thread describes the silent type as “very quiet,” and another user repaired an older mouse with an Omron switch instead. Compatibility is not only about footprint; pin length and actuator height also matter. A silent replacement can work for years, but the wrong pin style may not actuate correctly. [#20927537]

What should you consider before buying replacement silent mouse buttons from AliExpress for older or newer mice?

Check the button style, pin length, and whether your mouse uses a silent mechanism before ordering. One user bought 5 silent switches on AliExpress for a few złotys and reported good long-term results, but noted both long-pin and short-pin versions. That means visual matching matters before soldering. Older and newer mice may both use silent parts, yet the actuator geometry can differ enough to require a different pin length. [#20927537]

How can you restore an older favorite mouse with worn switches, broken plastic parts, or missing sliders instead of throwing it away?

Restore it by replacing the worn switch, repairing small plastic pieces, and accepting cosmetic wear if function returns. An older A4tech from about 2005 was kept alive with an Omron switch, a repaired power switch, and a tiny rebuilt plastic finger slider, even though its Teflon sliders were gone. Another BW-MO2 repair used a modified replacement switch and kept working long term. Functional repair can outlast a “temporary” fix. [#20913595]