I recently bought a used S&W Model 66-2. The gun seems to be in excellent condition, but I have a question about it's function. When I slowly pull the trigger, I hear one click, but not a a second click. I think this second click indicates that the cylinder is locked in place. In "Trigger Job," Jerry Miculek states you should hear this second click. Is this a problem? I have not shot the gun yet to test it's function. Thank you for any replies.