Originally Posted by
Dan Burkhart
It's a lot of material to remove with a hand powered facer, but a machine shop could do it pretty quick.
So could a guy with experience using a grinder, a chasing tool and a hand facer. Mark off the width edge needed with masking tape. grind away bits of the edge with a grinder getting close to but not on the tape edge. Clean out the shell of grinder crap and chase the threads. There might be some fresh cutting done deep inside the shell depending. Then a simple facing up to the tape edge. I have done this a few times back when i had a shop that sold Specialized. So if you get a Specialized MtB that is speced with a 73 shell but has a 68 shell blame me. Andy.