you got to be kidding me,recently picked up a mint poss. unfired S&W mod 37 circa 1983,love it,very accurate,pleanty powerful & mild to shoot,carries great in pocket,yesterday putt 150rds of mild 158swc reloads and 20rds fed pd's,stoped at gunsmith down the street and while shootin the brezze told him I wanted to bob the hammer on my mod.37 ,he showed me a few bob'd,smoothed and polished j-frame hammers he had and said he would install one on my gun for $20.00 (includding hammer) bring it by sunday...went home and cleaned her up and stopped by today,first thing he say's is I love the old style airweights, this looks new,about 20yrs old?, THEN he say's WOW have you been pounding it with +P'S? THE FRAME IS CRACKED,he then showed me in the yoke frame under the barrel what appear to be two 1/2 inch cracks. How could this happen? the stoutest loads i have put through it were the fed pd's?,He agreed the gun has been fired very little and is origional,the cracks were not there before and as said the loads i have put through it have been mild,frame must be defective..gonna call S&W mon. do you think they will back it or give me the run around?