A couple of ideas for your tight pins.  Pull the pin and apply
a liberal dose of powered chalk (chalk dust) in the hole and on the
pin.  Another solution:  supply houses sell pin block reamers that
size the hole for a particular sized pin.  Put the reamer in a electric
drill motor and run it in the hole a few seconds.  That should ease
the strain.

At any rate, take care of the problem.  It probably will not go
away and, as another writer said, "removing a broken pin is a
miserable job."

Good Luck

Dick Day
Piano Technician
Marshall Michigan