A bit of information about repairing stripped wood screw holes, based
on my experience and tests I conducted.  I have found that cyanoacrylate
(Super Glue) when used with talcum powder will produce a repair which
can be tapped and used with a machine screw will produce a stronger
repair than the original wood screw in soft wood used typically in
a piano and is, in fact, at least as strong as a wood screw in walnut.

Use traditional repairs when they're are adequate, but don't neglect
improved adhesives because they "weren't invented here".

Jim Cook