P,<div>Backing out the screw is loosening it, that may be the problem right there. Also, use a push pin tack. I find that works the best, same diameter as the track pin, has a good grip and short enough that there's no need to worry about bending. Flatten out the point too, although....whether there is a point or not...enough force and the right slip drives it through the finger anyway, lol.  </div>