Hey all, Had a quick question about gaps in the frames of first generations. I've got a few pair of first generations and have heard that there are slight differences based on when it was manufactured. I recently purchased two pairs used that seem to have some gapping between the lens and frame. Not sure if this is expected, but my other first gens lenses seem to site quite a bit differently in the frame. Should I be worried that these lenses are not actual first gen lenses, but replacements? Any other clues on how to tell if the lenses are first gen or now?