I have a Henry Golden Boy .22 lever action that someone had drilled and tapped for a scope. I don't want the scope but can't seem to remove the screws on the scope base. I asked the previous owner about it and he said the gunsmith he had do the work "glassed the scope base onto the gun. Does that mean he put fiber glass in the screw holes? If so how do I get the screws out without damaging the gun?