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sacredhart
gbj_tester
@psg1ben @sacredhart FWIW, here's one of my custom ones. 500mm shaft, so more like 540mm to the rails. Not difficult to make, you just have to cut up a generic multi-piece post and and turn some aluminium tube to make a socket in the top to take the recovered head. Kalloy make several variants with bonded-in head in both this Frog-eye style and 1-bolt Laprade styles.
This one is 30.4mm, but the one on my Azonic is necked down to 27.2 everywhere above the clamping area.