You cannot get under the veneer and pop it back out like a dent in your
automobile.  In the piano trade we use a burn-in knife with a wet towel
(a paper towel works).  The hot knife steams the water in the paper
towel and this steam swells the wood back up.

If your finish is thick then this doesn't work.  We then resort to
burning in shellac sticks.  These are available from Mohawk Finishing
Supply.  The USA toll free number is 800 545 0047.

Don Teach, Shreveport Music Co
1610 E. Bert Kouns, Shreveport,  LA  71105
dat-smc@juno.com