I think you have a 29-A or -B, not a 29, it's a completely different action inside form the later versions. On the later 29-A's & B's the action lock is soft metal and can get damaged or bent if someone tries to force the action open with it locked. As for the safety, try turning the safety button and see if that makes a difference, if it doesn't then I think the issue is with the trigger being worn.
This is from a thread linked to in the "misc-good-info" sticky above, the action lock on the 29-A is in the released position with the hammer down, the round wire spring goes under the pin on it.