Recommend you ask a gunsmith for help.
The original question was about a S&W MODEL 3914 with a serial number of TEC0486, which would have been manufactured c.1990 at the beginning of that model's production. sales@countrygunsmith.net
S&W will send you a manual for free or you can download one at their website.
Best left to a gunmsith
Best left to a qualified gunsmith
Best left to a gunsmith. S&W will send you a owner's manual for free.
You can get a manual for free by going to S&W's web site.
You can get an owner's manual for free at the S&W website.
You can get a manual for free at S&W's website.
You can get or request a manual for free at S&W's website
Need to know which model. S & W made a lot of 45's.
You can request a manual from S&W on their web site for free.
Request a manual from S&W or ask a gunsmith for help.