If memory serves, the "lux" had some goofy little quick release on one end of the straddle cable? Or was in where one end of the straddle cable hooks up? I dunno really, I didn't ride Mafacs back then and am only now trying to get saavy on them since I want to run Mafacs on a 60's bike I'm building.
--best,
dp
Dale B. Phelps
Los Gatos California
U.S.A.