I've been working on my front derailluer and have recently come across a problem. When in the highest gear, the chain still won't move on to the top set of teeth. I'm pretty sure this is because there is not enough tension in the inner wire of the front derailleur cable. I've tried to tighten it at the anchor bolt, however, I can't get it tight enough even when I set it to the lowest gear. Does any one have any suggestions on how I can tension the inner wire further? Thanks.