• the above is what you still seem to be not taking in.

    Right, because I still do not see a relevant amount of leverage being applied to a phalanx of two starnuts sitting 60mm at the inside of the tube and being guided by a 45mm snug inner stem (maybe I should really do a drawing that shows clearly the relations of leverage in the piece). If the design fails nonetheless, I can still change it until it works.

    In the end it's my money and my teeth, so you can only win ;-)

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