Just checked. I have a range of apertures - AGP, PH 6 Hole, old PH single hole, very old PH 6 Hole (the flat type), Central sight aperture, plus some unmarked ones, and they are all 40TPI.
Have the corresponding PH sight (and Central Sight) from my old 303 range rifle somewhere but the PH 6 Hole came out of it at any rate so no need for me to turn the house upside down to find it.
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