I am toying with the idea of converting my 750ss to dry clutch. The only issue I can't seem to resolve is regarding the mainshaft. On dry clutch bikes, the end of the mainshaft has both a caged needle bearing, and an oil seal, where the clutch pushrod runs through it. The 750 mainshaft does not have the correct counterbore to fit either of these items [neither the stock parts, nor any I can find.] I would imagine the bearing is there to support the end of the pushrod, but as it dosen't rotate [or shouldn't] I would not expect it to develop any "whip". Will the two O-rings on the pushrod seal well enough to keep me from pissing the contents of the crankcase out the end of the mainshaft? Thanks