Created out of necessity after my son smashed the original one. I took the opportunity to make two models; one similar to the original and another with a concave base. They are adapted for the 8BitDo PRO2 gamepad but I think it will also work for other gamepad models.

Gamepad disassembly instructions:
- Open the battery door on the bottom of the gamepad;
- Remove the battery (snap-on);
- Unscrew the 4 Torx screws as shown in the photo;

- Unlock the top cover from the bottom cover with an iFixit-type tool.
To replace the thumbsticks you do not need to disconnect any connectors.