Kraig,
Dont mean to brag, but that was my invention. I called it a floating idler and it was posted in 1999. It is designed for using the tiller on a CC with two shorter belts instead of that one long, pricey belt. We made this up using a front wheel hub and two pulleys, bolted to a pivoted shaft. The support plate bolts about mid-way along the frame, approximately in the area of the foot rests. Worked perfectly...no belt jumping and no slippage.