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Yeah I am betting on it being some sort of a tapered and threaded expanding insert, and a tapered and threaded lock ring top cap. Insert gets pressed in lightly into the top of the steerer tube, and the lock ring expands it ever so slightly and grips the steerer tube as the lock ring top cap is threaded in. Pretty clever. Would account for variations in steerer tube wall-thickness from on manufacturer to another.
Maybe they can machine a tiny and thin alloy or plastic cassette interface tool with a hole in it for an 8mm wrench, so that you can still preload the headset in case it loosens up on a ride. Otherwise you would be a bit SOL.
I love the concept of the whole thing. Seems like a fantastic design and execution overall.
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