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Or leave a saw width witness on the head of the screw and adjust the saw by eye using a loupe Personally I cut screw slots with a knife file

screw slotting files, But I can never get them to look right with a file Mine look like someone hacked

screw slot Use appropriately shaped files to square the slot and re-contour the screw head If you're careful, you can come pretty darn close to duplicating the

screw slot file Captive Screw, M4 X , Flare-in, PhillipsSlot Combination, Knurled Black Knob