They work by creating a convex surface on each side of the dressing post over which the axle ends are centered. It works but it seems stupid. I wish I had a feedback that fits into the wand with a feather-like stylus, creating an artificial axis that fits the vertical of the stylus being corrected. If I had the money to throw around fancy tools I would buy a Park Thru Axle adapter which is a complete axle.
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