There were three kinds of clutches put on these machines. There was a manual clutch, an electric clutch and a centrifugal clutch. I have had machines with the electric clutch and the centrifugal clutch. The electric clutch is still available, or at least was a year or two ago. The centrifugal clutch had a rebuild kit with the shoes, but those disappeared years ago. I bought the last centrifugal clutch from case several years ago. If you can find an old centrifugal clutch, a brake relining shop could make the shoes for you. I looked into that, and determined it was possible. I decided just to replace the clutch in the end. Case actually has some parts for those old machines available through suppliers. The mechanic I dealt with said he preferred the electric clutch to the other two, but I don't remember why. I know that if things are out of adjustment, engaging the electric clutch can be an experience. I really like the centrifugal clutch.