Help - Dr ked /gearlite XR-01 removing bezel to change led module

[Davyd]

I'd appreciate advice - I have Dr Led which some suggeste is the gearlite XR-01. I'd like to change the module to the DX R2 (like I have in my surefire 6p)but cannot easily get the bezel off the Dr led to do so. It turns around but does not seem to do anything and does not unscrew to allow access to the module as I expected

Can other suggest expereince in how to remove it? - I am loath to try more force