Just a quick question, but I have a 2000 Mercury 40hp 59 cu in with a little bit of work that I want to run a Yamaha painted black stainless on. I am currently running a factory Mercury aluminum prop and it has the tapered thrust washer. The problem I am running into is that the Mercury shaft is slightly longer than the Yamaha, so I am unable to get the nut tightened up when using the Mercury thrust washer and Yamaha prop combo. Should I run a Yamaha thrust washer? Both props have the rubber hub, not flo-torq if that helps.