Clearance with dry vs wet clutches

CudaFactHackJob said
The belleville spring retains the piston; the retainer spacer ring and a waved retainer ring retain the belleville spring in the drum; against the piston. How can you have .020 slop if the belleville spring is against the piston? What is a clutch retainer? What is a piston retainer?
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Terminology from the FSM

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The drum slides on the teeth. The belleville spring is as it should be, pressing on the piston.