The end shake is something that needs to be measured correctly. Most of our revolvers display a bit off endshake and rotational play when the hammer is down and the cylinder is closed. Cock the hammer, then check these things. Things should be more solidly locked up since the gun is ready to fire. If things are too tight with the hammer down, the action might bind during the process of cocking the hammer, either single or double action. Make certain that endshake is out of spec before taking any action!

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So long ... Ken