Incidentally the sear area is where many shade tree gunsmiths polish trying to smooth up the action and over-shorten the sear. This does not show up when shooting double action or rapidly cocking the hammer in single action, as the momentum of the spinning cylinder will carry it around to lock-up.
Again, slowly cock the hammer (being sure the gun is not loaded.) until it is at full cocked position, then press the trigger while holding the hammer back. If the cylinder rotates into position, its the sear.
If the hand is too short, it won't rotate.
I had one New Service where both sear and hand needed replacing. When firing, I had to finish rotating the cylinder by hand, otherwise I had some little lead "half-moons" fall into my hand when I opened the cylinder.
Bob Wright
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