I have a briggs reverse set up that came off an mtd rototiller, it has a pully mechanism that bolts to the block including the controls as well as the chain driven drive box. i'm working on removing the pins to take off the roto blades and wonder if it's worth the trouble. if anyone is interested pm me. $30.00 for all, plus the cost to ship if it's even worth it, open to offers, if no interest i'm scrapping it before I spend too much time getting it off the tiller. This is not the type where the cam comes out of the block.
