That I'm aware of, the E2d, like the E2e features a bezel with integral reflector - that is the reflector surface is applied to the inside face of the bezel and as such it is not possible to 'remove it'.
Yes, using a Uni-Bit will allow you to open it up to the desired size and an McR20 will fit. I've done it. Only problem is, making a light engine that will fit..
This E2d was pretty banged up. i'm the third owner of it. I was trying to remove the ano and I did.The thing is I thought I masked the reflector pretty good but guess I didn't. Th Easy Off wiped out about a quarter of the reflector.:mecry: