I have a Pro series 1911 that has the Novak adjustable rear sight with the fiber optic light rods. Today I adjusted the sight and one of the light pipes now falls out. looks almost as if it was super glued in place. Does anyone know how these are held in place?? it is mushroomed shaped on the end closest to you eye, but it looks as if the other end just sits up against the adjustment screw. Seems weird to me.