If I remember right, back when we all did this trick, the rebuild kits were not available- you could only buy the whole arm assy, which was expensive.
I could be wrong, but that is why I put pennies in there, until I saw the rebuild kits some 10 years later for $35 and bought one
I could be wrong, but that is why I put pennies in there, until I saw the rebuild kits some 10 years later for $35 and bought one