Unscrew the retaining ring that hold the battery pos. contact first,
then you can pull the positive contact board loose with a plier.
Unscrew the bezel ring & try to tap out the reflector, whihc is lightly held in place with an o-ring.
Once reflector is out, then you can pull the driver/heat sink out from the battery side.
Once you get everything out, you should study it before deciding what to do. Modding with SST may not make sense, you'll see why once you get it apart.