You have a lens that keeps popping out of the eyewire due to a mismatch between the base curve of the lens bevel and the eyewire. Using your fingers to reshape the eyewire is almost a guarantee that it will crimp. Instead, use this plier to gently and firmly reshape the eyewire curve. It is also safe to use on slightly warmed plastic frames. Our exclusive screw-free Delrin plastic pad eliminates the hassle of replacing screw-on type pads and the possibility of the metal screw marring the frame.