I recently purchased a 1989 Duo-Sport and have yet to begin to tear it down for overhaul. This is a first tandem for me but I have many vinatge road and MTB bikes so bike mechanics is not new to me. On this bike, there are no cable guides under the bottom brackets but three small metal brazed on loops that the bare cables pass through. The loops seem too small for cable housing and there are no stops for cable housing. Bare cable passing over the bottom brackets can't be the way it is supposed to be is it?