The reason why you can't bake them is because they are not sealed with glue . . . the lens is fused to the housing (read: housing is melted along the edges, then lens is stuck on it to while still hot). Or so it would seem from looking at it. The easiest way to open it up would be to cut around the outside very carefully. Not sure what the best way to do that is though since when I was grinding mine down, the plastic tended to melt and turn kind of gooey rather than turn into dust like you'd expect it to. It dremmels like styrene . . .