hey rich the discs wear about .004 per pass,they give you a dial indicator with the clutch you loosen the nuts on thepressure plate and reset the ring height,by adjusting the stands using the indicator.then you set the air gap by adjusting the linkage.the clutch cost me 3500,and you need a race pak or some other form of data to see when it is locking up.you can change that bybase pressure or counter weight pressure.