You can get a free owner's manual from S&W via their web site.
Follow the owner's manual directions. Ask a gunsmith for help.
No
Yes.
Yes, I have one
1865
What model?
Follow the instructions in the owner's manual. If you don't have one, go to the S&W web site and request one.
100-450 USD
NO
No, no, no. Do not attempt to do this.
Need the serial number to answer.
Your smith and Wesson model 64-3 was made from 1977-1987.