there is another thing to remember on adjusting the underbolt on the Flues, The flues has both underbolt & top ( rib extension) bolting.
"IF" the the top bolt is bearing with the lever coming past center & you then adjust the underbolt to bring the lever back to center you lose the top bolt bearing. Personally I think way too much is made of a centered lever. I would prefer both bolts carrying the load as to have the lever centered. The top bolt left of center does not mean the gun is off face, only that there is wear in the bolting surfaces. Once those surfaces are "Worn In" if you keep them lubed they can go a long long time without further wear.
