I just replaced pull start with roto start for Savage ss 4.6. It just slipped and could not turn the engine, not enough to fire up. I had pull start slipped before, but I took it out and cleaned the inside of the back plate from oil then assembled it and it worked. Then I replaced it with roto start, it just slipped right after the assembling. I don't think I miss any steps in assembling. What possibly cuases the slip and how to fix it. Well, I put some grease in roto start gears according in the manual. Could this cause the slip?? Thanks!!!!