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TrailBlazin is correct on the way things should happen, in a Colt percussion gun (OK, except the Root models) and the SAA and clones.
If the cam in the hammer is worn, the toe of the bolt might be slipping off to the side rather than off the front; that could mean the bolt will come down then either not clear the cylinder at all, or will come right back up, sometimes before the cylinder can even turn. That cam stud is not made as part of the hammer, it is a drive fit into a hole and can be replaced, although in most cases it is easier to just buy a new hammer.
When tuning an action of that type, one of the common techniques is to feather both sides (springs) of the bolt (on the inside) as well as the bolt spring itself. It doesn't need to be so strong the bolt dents the cylinder, but most are.
Jim
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