I have a 67 Sport Fury convertible with power windows. My right rear window regulator popped the clip that holds a roller on, so mthe whole thing got jammed. I was able to get it out and repair it with a new clip, but when I took it out, the spring fell off. Is ther a special way to re-install the spring on the regulator? Should th etension be to hold the window up or down? Howtight should the spring be?