May I jump in with a question on this subject? My 629-6 out of the performance shop, purchased new with less than 2 boxes of ammo through it would not always return the trigger & never if pointed up. Part of the probable was some glue looking stuff on the trigger block. I cleaned that up and it helped but not if the gun was pointed up. I removed the hammer block and the gun trigger returns perfect in all positions. Does the hammer block only serve as safety if the gun is cocked? Thanks!