[RawhideKid]

Simple, get something like the old school rulers, the ½" style, tape a piece of medium cardboard, like a slice of manila folder to the flat side kinda in the middle and cut it to 5/8" from the edge and through the inspection port, with throw-out bearing fully relaxed, lay the edge up side the pressure plate to get a distance to the fingers. The distance should be 5/8ths to 11/16th". Anything more will be way too far away from the throw-out bearing for the clutch to disengage.