The flywheels from the CF7 have holes that are too big for the PPW motor shaft. Also, these flywheels don't have any plastic inserts on either end. The hex shape on the driveshaft fits directly into the flywheel. The flywheels from the PPW motor have a hole with a plastic insert where a drive shaft will attach. Unfortunately, the hex drive shaft I have is incompatible. I'm going to take the entire mess over to the LHS and see what other parts I can get to make it all work.