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I have accomplished this several ways. They make a plug that you can screw into the holes. This leaves a little raised spot that is slotted. The other way is to lock-tite a flat head screw into the hole (you may have to chamfer the top of the hole if there is none. There will be less evidence that there is a plug there). Then cut it off and file the screw to match the surface area. Then cold blue the plug. Regards Bob