have removed the outdrive. can play with shifter and get neutral and forward. reverse seems to grab then drop out. do i need running rpm's for reverse to stay in? the shift cable outside cover has seperated where the cable comes thru at the shifter. red outside cover moves but the inside stays still. do i remove this cable from the outdrive end or carb end? do i tape a string to it as i remove it to help get the new one in, like pulling wires in conduit?