To use them you have to pry off the back of the handles (the blue tool is useless for this) and then unscrew the 5 screws on the back (2 in each handle and one hidden screw under the indication sticker in the battery compartment ). A screwdriver is handy if you don't already have a Torx screwdriver. Enough parts for two controllers. $12 is a bit pricey, but it's a vanity thing. It will not help your controller perform better. It's easy for you to enjoy.
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