My hybrid - being a "mechanics special" - needed several McGyver fixes to get the non-standard parts to fit.
For instance, the bike is designed for (and manufactured with) cable guides to use a (from the) top pull front derailler. The old classic FD I wanted to use was a (from the) bottom pull design. How to get the cable from the top guide to "pull" from the bottom? I fashioned a cable guide out of an old 3-speed cable pulley and made my own attachment clamp. Cable pulls from the top, travels 180 degrees around the pulley, and ends up pulling the derailler from the bottom. Works like a champ, out of the way, and cool as heck!