I have a 2006 rxp that I felt like wasn't hitting top speed as it should and wasn't turning the rpms it should so I pulled the sc to find that the threads on the end of the shaft had been stripped and it wasn't holding the impeller tight. Idk what caused it or who did it because I bought it needing work from a wholesaler. So far I haven't had any luck finding another shaft or another possible upgraded sc needing rebuilt. Any ideas of what to do?