After finding that the N-Gear Jump Stop (chain watcher) could not be mounted low enough and aligned at the correct height on this frame, I looked at other options. Forgoing the $90 carbon pie plate solution (available from Tandems East) because it would involve messing with the Bottom Bracket spacing, I chose to go with the K-Edge solution which is become a standard in high-end setups (SRAM is now including this chain watcher with it's top FD after Andy Schleck mis-shipped his chain last year at a critical moment in the TDF).
The K-Edge Clamp-on version (
http://www.acecosportgroup.com/shop/...n-catcher.html) would not install properly on this Calfee as the lower waterbottle cage boss is right where the K-Edge clamp would go.
Enter the K-Edge Adapter Clamp (
http://www.acecosportgroup.com/shop/...ter-clamp.html) and TRIPLE Chain Catcher (
http://www.acecosportgroup.com/shop/...n-catcher.html), plus a new Ultegra 6703 Braze-on FD, for a combined weight of 138gm. That is only a 10gm weight penalty over the original Ultegra 6703 FD w/bracket (128gm) and no chain watcher.
The one problem with the above solution is likely caused by the K-Edge clamp adapter, as the new Braze-on FD now sits nearly 1/2cm further outboard than the original FD w/bracket, resulting in the new FD maxing out on the inward derailleur movement. I've included a couple photos comparing the two derailleurs at the adjusted range.
Note, while the above solutions will prevent the chain falling inside the inner chainring, none of these solutions will prevent chain suck on the underside (more of a problem on mtn bikes), so be aware of that.
As always, shop around for best pricing on parts (above links for info only).