Hi folks - I've been working with Jim Welch at SickBikeParts to adapt their gas motor kit to a GT I-drive mtb that I intend to power with a 350W Unite 1016Z3. I've been looking for a freewheel sprocket or even just a freewheel for the output shaft of the Unite. It's a 11 mm (7/16") shaft with a 4x2 mm key. Jim suggested a BMX freewheel and machining an adapter but I'm wondering if anyone knows of anything off the shelf. I've checked the usual suspects - TNC, ElectricScooterParts, Monster and AllElectronics and I didn't see anything that would work. Thanks - jd