My Parker has all it's screws lined up in what was called 'North, South" alignment. When installing a screw into a newly drilled hole, first use a piece of scrap wood of the same type of wood. Drill your pilot hole with the same diameter drill bit. Start with the slot in the screw in the position you want it to end up in & tighten it. Most likely it will tighten up in some other position. Note the angle of the slot. In a new hole, start the screw minus the angle it ended up in before & it should be very close to N, S when tightened down, at least with in an 8th of a turn. That's not too much to force to N,S. Don't forget to use the trigger guard on the trial fits in the scrap wood.
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