hello, I am new to this site and I recently purchased an uncle mike's kydex paddle holster for my Glock .45 it has "adjustable" screws on for tension, but I can not get them to adjust? It seems the back of the screw (the nut part) is glued to the screw so when I try to use a screw driver to adjust the whole unit spins and spins. Has anyone else had this problem? Any suggestions?