The principal clutch is an advanced method of centrifugal clutch and is typically mounted into the output stop of your engine crankshaft. The clutch has two sheave faces; one that is laterally set (stationary sheave), and one which can go in and out to interact the belt (moveable sheave). https://gearboxcvt53185.blogocial.com/5-simple-techniques-for-gearbox-cvt-68207250