I have rebored hammers, two sets, and misses during boring. I use upright hammer shanks and any handy glue. During boring if I do not like the hole location is use CA glue so a few minutes later I can rebore. I insert the upright shank into but not through the hammer just short of flush on the back of the molding. If I am using CA it goes in next. If TITEBOND then it goes on the shank first. If you do not have a flat surface on the backcheck sind then you will need to use the other side as a 'hold it down and straight' side. The old glue must be cleaned off. I suggest using a SHARP bits larger than usual to allow for adjusting angles to the shank when hanging. This is not difficult, just tedious. Newton nhunt@gandalf.rutgers.edu
This PTG archive page provided courtesy of Moy Piano Service, LLC