Hammer Question

[B. Dudley]

Double check the issue.
Remove the screw and move the hammer and see if it is moving on the tumbler shaft. If it is, then it is the issue I described above. And of this is the case, the hammer should come right off the shaft with no effort.
If the hammer is snugly the shaft and there is movement of both the tumbler and hammer then something may be broken or tweeted inside the lock mechanism. The hammer should be firm at the "safe" half cock position unless it is pulled back against spring pressure, or GH trigger depressed and pushed forward.