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  1. You have to fill the space inside the steerer, either with a quill stem or quill adapter, so that the bending force will not cause a rapid catastrophic failure. The threading cuts the strength of the tube down to a fraction of what it was before, and it is extremely likely to crack if a threaded section of steerer is stressed like this without the stem inside the tube to reinforce the threaded section. The threaded design relies on a the presence of the quill stem for the system to function structurally.

  2. I wonder if in that application you could get a riser stem and go below the threaded part?

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