I don't know if this has already been addressed, I searched but didn't find anything pertinent. I am overhauling a 1920s Bach Mercury Model from the original New York factory. I found it at a garage sale and got it cheap. It was in a sad shape. After much TLC I have it mostly back together with all original parts used. I am considering getting a sand blasted finish on it to take out some major scratches and hide the two major patches i put in the cracked bell. I was wondering if anyone knew of the positives or negatives to sandblasting a horn let alone a horn that old (the SN is 468 >.<). I know a lot about repair, but not much about the effects of sandblasting. Thanks much. I hope to have it done by the new year and have some pics up in the eye candy section.