Originally posted by Dave C:
The cost of doing this would probably be in the $250 to $350 range (easily), considering the cutting, welding, shaping, recutting the serrations, and either custom making a strain screw or welding up the hole and starting over. That's not including the cost of refinishing.
The other option would be to find a stripped frame on GB and swap the parts. Even then, fitting a yoke, sideplate, and barrel would be fairly expensive.
The most cost effective way to do this would be to find someone to trade or sell yours and buy another.