I have this one too (2 modes
sick2
) and thought yesterday to try an aspheric after reading this thread but the reflector lenght is about 57 mm, so the big question is to know the focal lenght of the aspheric.
Internal diameter of the front head (threads for the bezel) is about 46 mm. Internal diameter of the bezel is 40 mm so it leaves 3 mm for the border of the aspheric lens.
How much is the external diameter of the dome of the kaidomain aspheric (42.86*14.3mm Lens SKU: S008248) ?
Head of the HS-802 is glued to the body.
No dropin but a pill screwed to the bottom of the head. Quite hard to unscrewed from the top of the head. Once I unscrewed it I made 2 notches to screw/unscrew it more easily next time.
There is a plastic washer (reflector seats on it) glued to the front of the pill, I failed to remove it so I can't modify the emitter but I will keep it for now because as it is, this flashlight is already a massive thrower.
The hotspot is very tight and bright with a usable spill.
I tried the suggested above tools last week but I failed to unscrew the head from the body on both Aurora AK-P7 and Ultrafire HS-802.