Best left to a gunsmith.
Your smith and Wesson mod 4043 is running between 240-400 dollars depending on condition.
Best to ask a gunsmith for assistance.
You can request a manual for free at S&W's web site.
call S&W or download a manual from their website. Best to ask a gunsmith for help.
This model will bring 300 in good condition,400 in excellent condition,and 600 if still new in the box (unfired).
A shotgun made for Smith and Wesson, sold under the Smith and Wesson name.
Standard Catalog of Smith and Wesson
The Wesson part of Smith and Wesson.
Smith and Wesson will tell you if you call them
Horace Smith, Daniel Wesson
Smith & Wesson was founded in 1852.
That all depends on what kind of Smith & Wesson it is.