My left bumper broke - I got lost and couldn't figure out what was going on. I followed a youtube video and took it apart and it was easy enough to replace (I also replaced the d-pad and sync button as they came with the kit). It's also nice that two joysticks are included (used to repair another). One thing I want to make sure of when replacing a broken bumper is that there are small clips on the outside that are part of the controller's main bottom plate with all the circuit boards. It almost forms a "D" shape and keeps the bumpers close to the body/in place by hugging the clip on the bumper. Mine was broken too, but replacing the bumpers seems to have helped - the left side wobbles a bit, but it doesn't click and wobble without problems.
Computer headset Razer Blackshark V2 X, green
86 Review
Sennheiser GSP 302 Gaming Headset: Noise-Cancelling Mic, Flip-to-Mute, Memory Foam Pads, for PC, Mac, Xbox One, PS4, Nintendo Switch, Smartphones
23 Review
Microsoft Xbox Wireless Controller Adapter for Windows 10 Black
25 Review
Wireless Xbox Controller With Audio Jack - Compatible With Xbox Series X/S, Xbox One, And PCs Running Windows 7/8/10 - Red
16 Review