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My current tandem also has a Atom drum brake (same one as used on old mopeds) and 2x cantis. Drum brake was pretty much useless and was a bit of a mission to get set up right when changing tyres etc as all cables had to come off. Do we have any engineering types round these parts these days? Maybe @mdcc_tester has an opinion?
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umop3pisdn
My old pug tandem had a thread on drum brake actuated by a friction gear lever. Not sure of the name of it. It weighed roughly as much as an oil tanker.
It worked really well at setting a top speed on descents and left the rim brakes for normal use. It did get insanely hot but never failed on me.
No doubt things have moved on since that was top shelf but it was a good bit of kit.