Enlarging existing bridge pin holes

[David Love]

I am repining a bridge and because the bichords are a strange in between
size (about 9 1/2), I need to enlarge the holes to accommodate a #10
pin.  I have not had much luck doing this in the past in a clean way and
am wondering how others approach this.  My thought is to reinforce the
bridge cap with a clear coat of epoxy first before drilling it out,
reaming out any excess that might create large globs inside the hole
before it sets up.  Any thoughts on this?  And what is the best way to
approach redrilling an existing hole: high speed, low speed, by hand?

David Love
davidlovepianos@comcast.net