What is the purpose of the external switch cap O-ring?
There is an external groove between the switch cap and the battery compartment that will accept a bezel down pocket clip. When the pocket clip is not installed, a thin O-ring may be placed in the groove to improve the exterior appearance. The external O-ring has no affect on the operation of the flashlight and is not required. The groove width can be adjusted by loosening or tightening the switch cap slightly, and should be adjusted to be large enough to allow the O-ring to sit down into the groove so it is flush with the outside surface.
