• I've got something similar which works.
    Designed by a mate who designs for a living.

    Same here. :-)

    His way to use a tyre-like rounded piece instead of flat is what I meant when I said I'd like to make use of the fact that the tightest point is at the top of the tyre.

    I am wondering why your mate has it reaching out so far if you know what I mean? You could have it a lot more compact I think. The short 'stem' is good, but I guess this combined with a starnut might be better?

    Are you actually using this one? What's your everyday experience with it?

    (and who's your mate? :-)

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