• I thought about complicated solutions to this for ages. Then I decided to use a chunky black elastic band (I think this came with an inner tube) and it works so well I can't be bothered to change it.

  • This and @Rik_Van_Looy's suggestions are edging ahead. I hadn't considered the cable slipping with the clamp. Thanks everyone for your ever-entertaining inputs.

  • That wouldn't have been the cable slipping; it would just be a fraction of a mm of bedding-in of the ends of the housing; a steel corner digging into aluminium or something.

    My method of clamping it tight with the housing straight and then putting the curve in it adds a heap of preload, guaranteed to stay solid.

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