A freind of mine won an NRA Edition model 637 in .38 but the key lock over the cylynder release does not work. The hammer does not budge, I tryed it as well WHILE reading directly from the instructions, 1/4 turn left the little "locked " flag comes up 1/4 right ,flag goes down, hammer still locked. any suggestions before he sends it back ?

e's not real happy with Smith at the moment.