my bike build is almost complete. i asked my local dealer if he would order me a 28.6mm front derailleur from campanoglo for me because the cut rate internet stores don't have that size. he needed to know if it was a top or a bottom. i didn't know what he was talking about. does the cable route along the top tube or come around underneath the bb? i had totally forgot about that part. my frame is a 97 cromo with downtube shifter braze ons. the only shifters i have installed have been downtube shifters. i am putting ergo shifters on this bike. naturally, the cables go down underneath the bb. i've done that before. you screw in that plastic dohingy. this is the part that i don't get, and please excuse the long wind. i can't imagine, looking at my frame, where the cable is going to go from the ergo shifters to the bb. do you install something onto the downtube? where do you cut off the cable housing etc.? your input is appreciated, as they are getting tired of me at the bike store. i almost got bounced.