I have a hosford screw slotting jig and their saw set. I normally use their largest slotting saw blade which is .025".
That would correspond with any of the Brownells magnatip bits ending in (-2).
I have found that factory Parker screw slots are actually a little larger than this. Maybe .030-.035". I usually find that the (-3) brownells bits work on original slots.
I hope this info is of some help.
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B. Dudley
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