^ Ive had the same problems before, the trick i always use when putting them back in is nose first, then put the bottom of both sides in the lense groove of the frame. If you just try to put one tab in the its gonna be pretty hard. Get the whold bottom lenght of the lense in the frame groove, and start working up the sides. Then try to snap a few in. One you get the first ones snapped in, work the frame up around the lense some more to get it in the groove, then try for the next ones. Hope that helps!