Originally Posted by comfortableshoes

I used to use a slotted bracket for mine, but THAT leaves a lot of pressure on the drive roller and however it attaches. When I did that I sheared off an attachment. It sucked to pedal home. Now I use a heavy door spring and a item I can't for the life of me remember the name of to perfect the tension. When I hit a bump, the spring allows the engine to move with the tire- no more broken shafts.

Even if I went back to using a clutch on either of my engines I would use the spring tensioner- it just seems more forgiving for the engine.