Flint is correct.
What caliber is your rifle, Pancho?
Why? (I hear you ask) If it's a 45 cal rifle, you may have a problem finding a 'smith to cut the dovetail. Sometimes, there isn't enough "meat" and they worry about cutting right through to the rifling.
I have the same problem with my (otherwise outstanding) 45 Colt 1892 Sporting Rifle. As you probably know, these rifles - 1860 Henrys 'thru 1892 Winchesters WEREN'T chambered in any 45 cal chamberings until the recent times.
By the way, I got this info from a true expert in the gun mechanic business, Nate Kiowa Jones - a.k.a. Steve Young. (of Port Arthur, TX)
http://www.stevesgunz.com/index.htm