Dunno, very few people have done it.
If it were me i would use a thin blade small handsaw at first i guess.
Along one of the edges make a slit til you get through the red lense, then see how muck space there is between red and clear, then go from there. Maybe use a dremel or continue to use a hand saw and break away pieces of the red lense constantly? Just be careful, lotsa light and a steady hand.
So i hear the clear lense is brittle and pretty thin, what are you gonna do about that? Put some coating or clearcoat?
Take lotsa pics when u do it.
Good luck.
