<HTML><HTML>Greetings,             &nbs= p; I have found that reeeeely nursing the screw before beginning to t= urn it in, "hunting", if you will, (in order "feel and seek" and insure the = absolutely correct previous helical path that the screw was in)  is the= only way to treat this. It's tedious but this "hunting" feel or technique i= s obtained the more times you do it. It takes longer, at first, but thats th= e con of an alumininininummm action rail. These rails are a pain for this re= ason. (Actually, I don't see any pros for their use.)             &nbs= p; Anyways, if you should strip the thread, I have heard of having to wrap t= eflon tape around the screw before replacing it again. Teflon tape comes in = various thicknesses, although I don't know what they are, or which thickness= to use for such an application.  I use the "nursing" method as describ= ed above and never had to use tape, so far, knock on wood. Julia, Reading, PA</HTML>