On the Sureflow Maxijet Mod kits, they work GREAT, but eventually, the shaft breaks, right at the end. I've got 3 of them, laying around, with broken shafts. It seems, one time while searching, I found replacement shafts, online. Now, I can't seem to find them anywhere. Any ideas? I'd much rather replace a shaft, on a perfectly good propeller and shroud, than buy a whole new kit.