If you like the video don't forget to Subscribe. I'll post more tutorials. Tools you'll need:
Nice screwdriver set: https://s.click.aliexpress.com/e/_9yRuHp
This one to easier separate the ring: https://s.click.aliexpress.com/e/_A01fV5

In this video I'm showing two way of fixing Drifting problem and also how to disassembly broken Oculus Quest Controller clean the buttons and take apart joystick to clean the membrane and extend the spring.
There are 2 fixes for this issue:
1) Temporary, when you need to use electronics contact cleaner spray or can be also 90% alcohol you apply it around buttons and press multiple times it may help but if the spring is already loose it wouldn't work, I'm explaining it in first part of the video. This technique can work with any type of controller would it be from Nintendo Switch , Xbox, Play Station...
2) Permanent fix or at least for much longer time, this involves controller disassembly after teardown joystick part expansion of spring, cleaning and putting everything together.

Timeline if you you are looking for specific parts.
0:00 Problem explanation
1:07 Fixing Controller without disassembly
1:09 Replacement / Removing the battery
2:20 Disassembling the controller
10:00 Finding the problem Joy Stick part disassembly and cleaning
17:34 Back Assembly with button fixing and cleaning if needed.
30:58 Fixing cracked plastic housing (more for protection of IR leds)
32:33 Final look