A gunsmith posted the following on the Fox Collectors forum:
There is only one safe way to remove a really tight screw without messing up the head. You need a drill press. Unplug it before you do anything. Do NOT plug it back in until you are finished with the gun. This trick will work with any gun.
Find a bit from a screw driver set and fit it nicely to the slot in question. Chuck the bit up in the drill press. Again, the drill press is NEVER TURNED ON. Once the bit is chucked up tightly, place the gun with the slot in line with the bit. Now lower the bit into the slot by using the handle on the drill press you would use to lower a drill bit into work. Once the bit is in the slot, keep good pressure down on the bit, take the chuck in your hand while maintaining the downward pressure on the bit, and turn the chuck counterclockwise. If it will not turn, you may need to put a pipe wrench on the chuck. I have never ruined a screw or failed to remove a stuck screw with this method. Again, the drill press is NOT plugged in, this all happens manually.
PS. Two people make this a much easier process if an extra set of hands are available.
