I have one very strange problem and i need help. I Have one mountain bike my friend gave to me. I true the rear wheel i replace the front wheel is was bent. I install v brakes i replace cable in the RD is shift okay. FD i put one old i had i put new cable but The FD not moving at all. The shifter move the cable when is loose but when i attach the cable to the FD screw the FD not move at all. What is can be wrong.