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I've inserted a straight pull spoke, used digital calipers to measure from the inside of the flange to the outer edge of the spoke, and then done a bit of maffs to work out where the centreline of the spoke hole is compared to the centre of the axle. It matched up exactly with what the manufacturer said it was, but I don't like relying on manufacturer's dimensions if I can measure them myself.
Alrighty - anyone have an idiot-proof method of measuring straight-pull hubs?
This image I came across shows measuring to the mid-point of the flange in between the spoke holes which seems straightforward enough when doing the lock-nut to flange measurements, but how do you accurately measure the flange diameter accurately as the spoke seats are recessed?
Cheers!