Regarding the comments by Andy Taylor:  If I ever saw a piano with the
pins pounded in I'd head in the opposite direction.  Loose pins can be
dealt with in one of a couple of ways.

One way when the problem in not severe it to position the piano so that
the pin block is horizontal and use pin block treatment.  This is an
anti-desiccant that will tend to absorb moisture from the surrounding
atmosphere thus swelling the wood back to where it normally was.  This
treatment is usually more effective when a piano has been placed in an
environment of very low humidity for an extended period of time.

Another way of treating the problem of loose pins is to use pin shims
which are readily available from piano supply houses.  Replacing a
wrest plank, or pin block, probably would not be a cost-effective job
on most pianos.

Hal Davis