Unfortunatly, I think that you are correct. I would be better off re tapping the hole. And I think that it is a number three screw, and I dont know if I can get the same size head on a number three, as is on the number 6. I have a drill press, but by the time I buy the tap and drill bit, It would be just as easy to have the gunsmith do it. I might just see how much he would charge to cut a dovetail in it, and get rid of the ramp.