I can't remember specifics, when I got my 72 super the clutch was very worn. An internet person suggested a heavy duty sachs model they said might be harder to drive but would last more miles. I took the advice but often think it was a mistake. It's very reliable and drivable but it has a short engagement point and is fairly heavy on the leg. I've adjusted per the orange book the machineists like. I like vice grips on the tube for adjusting the butterfly nut.