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ffm
Diamond_Supercool
@hugo7, Yes. I had to pinch that thumb shifter from an long-abandoned mountain bike. We're running it with a brake cable rather than a gear cable. Works absolutely fine as a parking brake. Goodness knows whether I'd trust it on a long sketchy descent though.
@ffm, the bolts are threaded the whole way down and not done up tight. But you make a good point; I should probably source some semi-threaded ones.