On our Co-Motion Speedster Tandem we have Ultegra brake/shifters. In preperation for a trip I bought extra cables in case of a problem. Though the problem now is I cannot see how to get to the derailer cable! I can see how to access the brake cable after I use a jeweler's size phillips but am clueless about the shifter cable. I looked at Shimanos site but the exploded view did not seem to help.