I tried to find some sort of tutorial on how to fix a crunchy mod button, but since I didn't found one that worked for me I used the following technique:
First the problem: upon disassembly of the button I found my clone (https://www.fasttech.com/products/1467801) had really poor button machining. I could feel if scratched the button with the tip of my nail lots of small grooves. This made a squeaky/scratchy sound every time I used it.
Solution was to polishing the button, so I started by finding a compatible screw. It was just a standard m3 screw which I connected to a rotary screw driver.

After that I screwed the button.

To polish I started with 1000 sand paper wrapped around a flat piece of metal.

Used the screw driver on positive direction, so as to prevent the button to unscrew and filed until I got a somewhat foggy, but consistent finish.
At this moment the button was almost perfect but I gave it a second round with medium polish compound (the same to polish car paint). Metal Polish would be probably better but I didn't have it.
I used a polishing disk from a dremel kit.

This gave a nice finish and slighter smoother action.

Since I was at it, added 2x0.3mm shims on the button screw to reduce throw.
No more squeaky noises and much smoother action.
To be 100% perfect I should polish the bottom cap where the button sits, but haven't found a polishing disk thin enough to fit there...
First the problem: upon disassembly of the button I found my clone (https://www.fasttech.com/products/1467801) had really poor button machining. I could feel if scratched the button with the tip of my nail lots of small grooves. This made a squeaky/scratchy sound every time I used it.
Solution was to polishing the button, so I started by finding a compatible screw. It was just a standard m3 screw which I connected to a rotary screw driver.

After that I screwed the button.

To polish I started with 1000 sand paper wrapped around a flat piece of metal.

Used the screw driver on positive direction, so as to prevent the button to unscrew and filed until I got a somewhat foggy, but consistent finish.
At this moment the button was almost perfect but I gave it a second round with medium polish compound (the same to polish car paint). Metal Polish would be probably better but I didn't have it.
I used a polishing disk from a dremel kit.

This gave a nice finish and slighter smoother action.

Since I was at it, added 2x0.3mm shims on the button screw to reduce throw.
No more squeaky noises and much smoother action.
To be 100% perfect I should polish the bottom cap where the button sits, but haven't found a polishing disk thin enough to fit there...
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