My thumbstick is rubbing on the LEDs during game play:
Tear down the controller and shift the led ring until there is no contact with the leds. This doesnt require full removal of the led ring, you should just be able to slide it with a little bit of pressure from your finger. The led rings are designed so the leds will sit under the stick.
How does this fit on my c-stick?
You likely have a t3 stickbox and you will need to flip the jumpers from the front of the board to the back of the board. Refer to the video and installation pictures.
My shell doesn't close all the way:
There are some small cuts required to close the shell entirely. Please refer to the picture and we recommend you use a silver sharpie to easily see where those spots might be. If you are using a T3 shell back (i.e. a shell back that is from the smash 4 controller, smash 5 controller or an original controller with the CE logo and a dot) and a t3 board, there may be a cut required after flipping the jumpers from the front of the c-stick PCB to the back. Again, use the silver sharpie technique to see where the final cut needs to be made.