You can get a manual for free at S&W's website.
You can get an owner's manual for free at the S&W website.
Ask a gunsmith for help or ask for a manual on the S&W web site.
Recommend you ask a gunsmith for help.
Best left to a qualified gunsmith
S&W will send you a manual for free or you can download one at their website.
All model 39 Marlins were built in the 1922-1938 time frame. A model 39 with S prefix will usually date to the late 1920's. However, model 39a Marlins with S prefix date to 1957. So it depends on which model you have a 39 or 39a.
You can get or request a manual for free at S&W's website
You can get a manual for free by going to S&W's web site.
http://stevespages.com/pdf/s&w_pistol.pdf to download a manual
Need to know which model. S & W made a lot of 45's.
a manual can be had from S&Ws website or you can ask a gunsmith for help