Gluing in bridge pins with epoxy works esp. if there is play in the
pin, or the cap is cracked.  Removing the resulting "mound" can be done
with a razor blade and dentist pick and eye protection.  If the pin is
stable enough when the glue is wet, a string (cotton cord) of suitible
diameter can be run by the pin and string groove in a way that doesn't
smear the glue.

   I havn't had a chance to use this method on epoxy, but it did work
when I experimented with J-B weld on a badly cracked bridge cap
(bass)  A Dremel moto tool with the little round wire brush worked
wonders.  Mine happens to be the battery powered model, but it should
work with the cord model as well.  It "sculpted" the dry J-B down to
the metal of the pin and the wood of the cap.  Epoxy though might be
too elastic.  If you try the moto method on epoxy let us know the
results.

   For pins that are not visibly loose, but come out with a test pull
using tweezers or forcips, I have good results with liquid crazy glue.
The piano has to be on its back. Drive the pin if necessary.  Apply
glue over a period of three days until no more glue is absorbed. Wait
another 24 hours before putting back the string.

Richard Moody  ptt