Ah, I see where weāre going with this
First off I have to apologize. It was too late last night for me to try to be helpful and I mis-remembered how this switch goes together. It was laying on my work bench already disassembled as part of a current project so I just measured it and posted without double-checking. Sorry about that
The rubber ābootā under the piston switch isnāt separate. Its attached to the center portion of the switch cover. I really thought it was a separate boot in here. Iāve got several of these and maybe the design has changed? Or maybe I was just wrong. Regardless, this particular light Iāve got in front of me at the moment does not have a separate rubber boot inside.
Now that thatās out of the way, hereās some more photos of the assembly. First the threaded section I measured last night:
Now the interesting bits. Hereās the whole switch cover assembly turned upside-down:
This is made up of two parts. From the outside youād see them as the outside part (the āsleeveā) and the inside part (the āpistonā). Most of what you see in this photo is part of the sleeve, but that bottom rubber ring (top in this photo; its upside-down) is attached to the piston.
The piston just pushes out of the sleeve. Its friction fit and held by the translucent ring mentioned earlier along with the bottom section of that black rubber seal. Pushing the piston out, hereās what it looks like:
Thereās that black rubber seal assembly that provides some springyness and water resistance. That leaves the sleeve part left. The translucent nylon bit is attached to the sleeve and it looks like this:
Iām sure that nylon ring could be removed with a bit of persuasion but I didnāt try. Donāt really want to booger it up.
Now for the proof of concept - I reassembled the switch cover assembly and put it back into the tailcap. I did not put the switch back in since any sort of lighted assembly would be on/above that board anyway. Then I held a small flashlight up inside the tailcap and turned it on. The result looks like this:
Now I think that looks really cool! Its kinda orange; not sure if thatās reflections from the red host or if its the tint of the nylon seal, but it works well on this red light. Iāve got blue and green hosts I can experiment with to see how those colors react, too.
Hereās the bad news: thatās 85 lumens Iām shining up in there. I could still see the light pretty well down around 20 lumens, but as should be expected, that black rubber seal doesnāt lend itself to light transmission. I donāt even have any clear/translucent switch caps to play with here but it may be possible to cut the black rubber off of the bottom of the piston and use a clear switch cap in its place; Iām not sure yet. But that should require a lot less light to get through there. Iām going to keep poking around at this though because Iād love for my S2+ lights to have this feature.