Scorpion lens is press fit,30mm dia, 1mm thick (as close as I could meassure it: can't find my calipers, so used a depth gauge /ubbthreads/images/graemlins/blush.gif
I'd really like a glass replacement lens, but I very much doubt it could be "snapped" in without breaking (OTOH, the retaining lip is only half a millimetre, maybe less).
Maybe handfull of plastic lenses, against future mishaps...