You need the services of a gunsmith.
50-250 usd
22A used about $199. New at Cabela's $239.
75-220 or so
You can get manuals at the Smith and Wesson website.
You must call S&W to find out.
You can request a manual for free at S&W's website
Ask a gunsmith for help.
check at: http://stevespages.com/page7b.htm
Ask a gunsmith for help.
You can request a owner's manual on the S&W web site for free.
Recommend you seek the services of a gunsmith.
Recommend you ask a gunmsith for assistance.