Shower handle screw stuck! Complete A-Z tutorial

If you've already tried WD40 and different size Allen keys and torx bits and you're a 100% positive the screw is stripped these are the necessary steps in order to remove the shower handle so that the cartridge can be replaced. This technique works on most shower handles even though the brands may vary. This one is a Kohler shower valve

Kohler Part GP876851 Rite-Temp Mixer and
Pressure-Balancing Unit Kit
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Kohler TS15621-4-CP Coralais Lever Handle
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Tools List
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