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The HP-10 front reflector shroud will unscrew without damage ...
after the internal ring is unscrewed (from inside the light body)
There are locking pins around the back of the shroud ,
which hold it locked in place to the front of the plastic body ,
not allowing it to be turned - if just attempting to do it externally.
You have to go at it from the inside of the case . Once that internal ring
is unscrewed from the shroud , it allows the shroud to move forward ,
which allows the locking pins molded onto the rear of the shroud , to
then come out of the holes in the body , and the shroud can then turn .
If those shroud pins are permanently removed , it will allow the shroud
to be unscrewed in the future without having to first gain access to the
interior body of the housing and that internal screw ring . (Hot glue might
hold that internal ring in place.)
Once the shroud is removed then you have access to the reflector .
The reflector can even be temporarily removed at times for doing
close-up work ... allowing a pure flood beam . (Like a ZebraLight beam )
Once you know how to remove the shroud and reflector, you can experiment.
TMG