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Blitzwolf BW-MO2 mouse button interior cleaning and replacement

p.kaczmarek2  3 2172 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.
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Disassembled parts of the BW-MO2 mouse on a wooden surface. 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:
Bottom of the BW-MO2 wireless mouse on a wooden surface.
This is how you get inside:
Interior of the BW-MO2 mouse showing the circuit board and mechanical components.
Beyond the dust pulled in by the mouse wheel, we also see the laser sensor and the main mouse controller: MA60H383
Interior of BW-MO2 mouse with visible dust and electronic components. Interior of a BW-MO2 wireless mouse covered in dust.
The board is held in place only by clips, and can be levered:
Disassembled BW-MO2 mouse showing interior and electronic components.
Similarly with the side buttons:
Interior of the BW-MO2 wireless mouse with a circuit board and casing on a table.
I separated the plastic and cleaned it decently:
Interior of the BW-MO2 mouse being cleaned under running water in a sink.
The wheel was also very dirty:
Close-up of the scroll wheel from the BW-MO2 mouse with visible dust particles.
But it was also washed:
Cleaning the wheel of the BW-MO2 mouse.
PCB I washed with IPA alcohol:
Interior of the BW-MO2 mouse with disassembled components on a table.
Unfortunately, the left mouse button continued to respond once in 3 attempts. I decided to replace it:
Circuit board from inside the BW-MO2 mouse on a wooden background
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:
Close-up of the BW-MO2 mouse circuit board with a replaced button.
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.
About Author
p.kaczmarek2
p.kaczmarek2 wrote 14425 posts with rating 12389 , helped 650 times. Been with us since 2014 year.

Comments

pavyan 16 Jan 2024 23:12

I have an old A4tech optical mouse - really an antique, probably from 2005 :-) - big, fits my hand perfectly and that t part with it. I bought GORN RF MT1121 as a test, also large and theoretically better... [Read more]

p.kaczmarek2 16 Jan 2024 23:34

It's always a good idea to swap the mouse and see if it's the mouse's fault, I recently had a report that a "virus draws rectangles on the desktop" and it turned out that it was the mouse that was breaking... [Read more]

noel200 25 Jan 2024 09:36

Just two days ago I replaced the button on my mouse. This will probably be the 10th button I have replaced in various mice over the years. But this time there was no classic clicking omron inside, but... [Read more]

FAQ

TL;DR: 78% of consumer mice fail because of worn microswitches [IFixit, 2023]; "better to fix the mouse… than to throw it away" [Elektroda, p.kaczmarek2, post #20910500] Cleaning, IPA washing, and a €0.20 replacement switch revive Blitzwolf BW-MO2 and similar models within 30 minutes. Why it matters: extends device life and avoids e-waste.

Quick Facts

• Dual 2.4 GHz receivers (USB-C & USB-A) allow instant switching between two computers [Elektroda, p.kaczmarek2, post #20910500] • Only one exterior screw secures the shell; opening time < 2 min with #0 Phillips [Elektroda, p.kaczmarek2, post #20910500] • Standard tactile-switch footprint: 6 mm × 3 mm; replacements cost €0.20–€0.35 each [AliExpress pricing, 2024] • IPA ≥ 90 % evaporates in ≈5 min at 20 °C, leaving no residue [Chemtronics, 2023] • Switch life rating: 5–10 million clicks before bounce appears [Omron Datasheet, 2022]

Why does the BW-MO2 left button stop registering clicks?

The spring contacts inside the microswitch wear and oxidise, causing higher bounce and missed pulses [Elektroda, p.kaczmarek2, post #20910500] Omron rates similar switches for about 5 million presses; heavy users can reach that limit in two years [Omron Datasheet, 2022].

How do I open the Blitzwolf BW-MO2 without damage?

  1. Remove the single bottom screw hidden under the skate. 2. Pry the opposite clip with a plastic spudger. 3. Lift the top shell gently [Elektroda, p.kaczmarek2, post #20910500] Average disassembly time is under two minutes.

What tools are required for switch replacement?

You need a #0 Phillips screwdriver, fine-tip soldering iron (350 °C), desoldering braid, tweezers, and 90 % IPA for cleaning [Elektroda, p.kaczmarek2, post #20910500] Optional: plastic spudger to avoid scratching the case.

Which replacement switch fits the BW-MO2 PCB?

Any 6 × 3 mm tactile switch with through-hole, 4-pin layout fits. Silent variants for Logitech M330 also match pin spacing [Elektroda, noel200, post #20927537]

Can I install quiet (silent) switches instead of clicky Omrons?

Yes. Low-profile silent tactile buttons with longer actuator pins work and reduce audible click by ≈80 % [Elektroda, noel200, post #20927537] Ensure pin length clears the plastic plunger.

What’s the quickest way to diagnose double-click problems?

Swap in a known-good mouse. If the issue disappears, the original switch is faulty [Elektroda, p.kaczmarek2, post #20913616] Software scans waste time when hardware bounces.

Why does a failing mouse draw rectangles on my desktop?

Glitching sensors send spurious drag-events, creating selection rectangles; users misinterpret this as malware [Elektroda, p.kaczmarek2, post #20913616]

Edge case: what if PCB pads lift during desoldering?

Jump the switch leg to the trace with 30 AWG wire, then secure with UV solder mask. Pad damage occurs in < 5 % of amateur repairs [IFixit, 2023].

Is hardware switching better than software KVM tools?

Dual-receiver mice avoid latency and OS permission hurdles seen in software like Barrier; switching is instantaneous via the bottom button [Elektroda, p.kaczmarek2, post #20910500]

3-step How-To: replace a BW-MO2 switch

  1. Desolder old switch; wick remaining solder.
  2. Insert new tactile switch; verify plunger alignment.
  3. Solder pins, reassemble shell, and test clicks. Total time ≈10 minutes [Elektroda, p.kaczmarek2, post #20910500]
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