Hi, Ihave some old aftermarket kits that look to be some type of overcenter handclutch. when we got these they were at a IH dealer sellout. they were in wooden crates with instructions.that was 25 years ago.The instructions did not survive. But i remember they were for f-20 & 30.They were called Sav-A-Back.I dont know if they were for releaseing trans for cranking or to hook up implements. look like they could have been a widowmaker. They consist of a unit with heavy spring inside, a lever, a clamp for clutch rod, bolts & brackets. i am trying to mount one on my f-30 , but i must be short some hardware. any body have one of these.any pictures or help would be appreciated. Thanks Steve