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Message: <blockquote data-quote="_CY_" data-source="post: 1265943" data-attributes="member: 7629">check to see if Model 18-3 is in time. accuracy and safety depends on cylinder being in correct position when hammer is dropped. cock hammer back into locked position. cylinder properly in time is locked up. [ATTACH=full]78725[/ATTACH]cylinder stop is in center of picture[ATTACH=full]78726[/ATTACH]slowly pull trigger, cylinder stop will first drop, then raise up about mid point between slots on cylinder. as hand rotates cylinder, stop will dovetail into slot locking up cylinder. [ATTACH=full]78727[/ATTACH]if you can rotate cylinder with hammer fully cocked, then revolver is out of time. fixing requires ordering an oversized hand, requires custom fitting. [ATTACH=full]78728[/ATTACH]use a feeler gauge to check gap between cylinder and barrel. call S&W for tolerances, which could be different for each model. Model 18-3 measures .007in front gap (.008 feeler gauge was a forced fit), .006in for rear gap. side to side rotation at lockup ended up at .003in after new stop was installed. [ATTACH=full]78729[/ATTACH]Fin.... whew, what a long writeup!!!and yes double action is smoother and cylinder lockup is tighter. [ATTACH=full]78730[/ATTACH]</blockquote>