I'm running a single chainring setup, right STI shifter and an aero brake lever on the left. The STI levers have an angle to them for easier reach and the aero brake doesn't. I have a left (broken shifting)Tiagra STI lever that I would like to gut and just use for braking. I've taken a few nuts and washers off but I've run into a deadend. There seems to be a long bolt running through the mechanism, I have nut off but the bolt won't budge. Can someone help me?