Originally Posted by
Bandera
Run your FD cable under the lower left guide and then under the upper left guide to clear your seatube, it uses both guides.
Also, slide the guide down towards the BB.
-Bandera
Ding ding ding, both "channels" are for the front cable to be strung in series. Sliding the clamp toward the BB shell will allow the cable to clear the seat tube. Note the little rectangular foot on the guide is to contact the bottom bracket shell.