i was just trying to start my rs4 2 and the cord just snapped where the knot by the coil is (about 10th thing to break on it in 2 months) . i took it apart and recoiled it just like the instructions from hpiracing.com and the coil just doesnt have enough power to coil itself back up again. do i need a new pull starter (because you cant buy just the coil) or is there something i can do to fix it?