The Duprat 5-pin hollow steel crank, sort of octagonal section, weighhed 3 gam (0.1 oz) more than the comparable TA cyclotourist right crank. I think they were 159 and 156 gm, respectively, but can't put my hands on that list right now.
harvey sachs mcLean va ++++++++++++++++++++++++++++++++++++++
Weren't the hollow armed steel cottered cranks just as light as Al alloy cotterless? I hefted a '50s Durax (?) octagonal armed crank and although I didn't weigh it, it felt about the same as Al alloy Campagnolo Record cranks to me weight wise.
Kurt Sperry
Bellingham WA
USA