While I personally don't have anything against 7900s, I can see both sides. I just bought one knowing it wasn't a mantle piece. In your position, the frustration is perfectly understandable. If I were in your position, and really only needed a saw to do the bucking the choice is clear. Sell ALL four of the 7900s, for parts, occasional runners, whatever. Buy one saw that you trust 100%, and get rid of the hassle. The money you have lost will be tiny compared to the continued headache you seem to be having. I do agree with one thing though, at this point most mechanics would have this thing figured out. Anyone on here you trust to go over it, to prove that if it is 100% it can be a decent saw? Just askin'
Shea
BTW---Good luck with whatever you do.
Shea
BTW---Good luck with whatever you do.