"Parker Standard" mid-bead placement on the rib as quoted from a 1929 factory spec sheet: for non-vent rib barrels up to 28 inches, bead placement @ 14 inches; for barrels 28-32 inches, bead placement @ 16 inches UNLESS OTHERWISE SPECIFIED BY ORDER. LDG Sr. cut a nifty gauge out of 1"x 1/8"x 36" that, when hung over the muzzle, "center-punched" the correct FACTORY placement of barrel beads. What criteria were used after-market is anybody's guess.
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