The bezel unscrews from the Light engine. It
is glued however so use a couple mouse pads to unscrew them. Remove the glue with a sharp pick (it comes out easily). Then a pair of tweezers or snap
ring pliers to unscrew the reflector. Reassemble with new reflector. It should
remove most of the rings and artifacts in the beam w some loss in throw. I bought stipled reflectors for my D-mini's and WOW what a difference. It's mainly
for those of us who are picky about the beam. 4sevens was nice enough to
help us out so may as well try it.
If you want your L1D-CE back(Well, maybe not your L1D-CE but another), just buy the L1D-CE body and it should work since the L1/2D-CE and P2D-CE use the same head.