I've got a Cannondale Ironman 2000, (2003 frame). I've got it all put together except for derailleur wiring. C-dale attached a small black plastic cable guide to be used below the bottom bracket, as a cable guide. Its a snap on, proprietary guide I think. All my other bikes take the shimano derailleur cable guide, 4 mm screw, which most bikes have and you screw on the cable guide below your bottom bracket and that sucker is on there.

This freaking thing, although it snaps on, will come off as I move the bike around. I haven't put tension on the guide with the wires to see if that wire tension will hold the cable guide in place.

I've got a bad feeling this is going to be a problem. That it snap out and start moving back toward the rear.

Question Will that hole take a short screw and can I still use the shimano guide but just find a different screw? It certainly won't take a 4 mm screw and I've tried every size screw in the garage.