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April 24, 2017, 4:44 p.m. -  Andrew Major

It has to be an expanding insert in the steerer tube which then uses the cassette-lock-ring-like stem cap to tension the headset? My first thought was an insert from the crown like the old Answer or more recent Chris King tensioning systems only hollow in the middle (instead of a rod) but the former idea would be much simpler to adapt to the huge variation in steerer lengths.

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