Far as the fiber PTO clutch wear buttons My old 129 used to spit a broken one out every year or so. I found that gently pushing and twisting the new one in worked fine every time with just My finger tips. I bet the one in My 72 is TEN years old! IMHO the mechanical PTO clutches are MUCH more durable & reliable than the electric clutches. I've never had any problems with the PTO clutch on My 982 but I know it's just a matter of time!