I’m trying to install a fibre optic front sight on a vent rib barrel. The old sight was damaged. I’ve got the new sight and it’s the correct thread but when it gets tight it’s cross way on the barrel. I don’t want to torque it as I’m afraid it will break off and I’ll have another problem. What would be the correct way to “time” the sight? I was thinking either a thin shim under it or filing the bottom of the threaded portion until it lines up. Looking for input.