I can also recommend Russ MacKay for the repair of your bird box.
I sent him mine after it had fallen onto a hearth (while playing,
of course) where it suffered blunt force trauma.

I was sure it would never sing again, but Russ restored both the
clockwork and the case to absolutely "as new" condition.  He even
re-feathered the little bird which was looking sad and moth-eaten
before the fall.

I found his price extremely reasonable as well, and the turnaround
time, considering what he had to work with, amazingly short.

Bruce Duncan
San Diego, California, area