I have a 2008 Cannondale Six 13 frame which has a 34.9 seat post tube diameter. I have an Ultegra FD-6700 which is a clamp on, stamped right on it, 34.9 as well and for the life of me cannot get it to close around the tube. The screw is a little too far away to thread in. It may work with a longer screw but I'm thinking something is not right. There is no spacer on there either.
Any ideas or recommendations?