I think THIS is what you’re looking for.
EDIT: sorry, this is the driver retainer ring.
Yeah, it’s strange KD only sells the driver retaining rings.
On the “Misc-Parts” sub-page you’ll also find an “S2+pill & driver retainer ring”.
Yes, and other pills too, but all I’m looking for is a switch retaining ring.
Thanks for looking! 
ID, OD, thickness, thread shape/pitch… I imagine it’d be too easy to get the wrong beastie anyway.
I’d ask Simon directly. If you got something you’d want to buy, he’d probably throw in a couple Just Because. He’s wonderful.
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Why do Swifties get bent out of shape if anyone doesn’t absolutely love Taylor Swift?
I think I’ve mentioned this before, but most people don’t like my very specific musical tastes, and it doesn’t bother me.
“Different strokes for different folks.” 
I saw a comment someone had re-posted on r/facepalm where someone not only got all upset but accused the person who’d said it of being a misogynist. What heinously sexist thing had he said? “I don’t really listen to Taylor Swift.”
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Other than that duet she did with The Goat, I have no idea what other songs she did.
The Goat never got his due, if you ask me.
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Why do some retaining rings have left-handed threads? Obvious answer is to thread onto the left-handed threads of the host but why are those threads left-handed?
Years ago I totally trashed one of my early projects because I had no idea. It seems it was an Astrolux C8. Ever since I have wondered why and never came up with a satifactorial answer.
So they don’t accidentally come undone when tightening the head?
I think you are referring to the retaining ring in the tailcap. All my lights have right-hand threads at the tailcap side. The older ones, Surefire(s), Trustfire, Warsun(s), and the Convoy S2 have retaining rings in the tailcap that share a the threads with the body of the light. In the the last mentioned light the retaining ring sometimes comes undone when I remove the tailcap when changing the battery. In the older lights that is less of an issue because of the finer pitch of the thread.
New lights in general have a wider pitch (and wider tolerances if I may say so). With a left-handed thread (eg left = fasten) you prevent the retaining ring in the tailcap from accidentally becoming undone when unscrewing the tube (eg left = loose).
For the same reason the pedals of your bicycle have different threads (left pedal has left-handed thread).
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I have a theory about this, specifically with the switch retaining rings of the Convoy S2/S2+/S3/etc. flashlights.
With the current design, the tail screws onto the body until it hits the tail shelf.
But there wasn’t a tail shelf with the older Convoys. The tail would screw onto the body until it hit the switch retaining ring. The retaining ring was also much wider.
So when removing the tail that has a left-handed retaining ring, the movement is in the tightening direction. Perhaps that kept the retaining rings from loosening over time.
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Anyone know if Convoy’s 5 amp buck driver still has issues with stepping down faster than they should?
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Does anyone know if it would kinda work to get a XHP50.3 HI in this lens?
https://www.aliexpress.com/item/1005002280736440.html
Pic in case the link does not work for you:
That would mean to sand it down like this… I am not sure if that is a good idea 
If you have any other recommendation for a pebbled TIR with these dimensions that can take a 5050 LED, I’m happy as well.
So, totally not-stupid question. Would Off-Topic Chatter be the best area to make a New Light Day post in?
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Good question.
Since it’s about flashlights, maybe use the following category… 
https://budgetlightforum.com/c/led-flashlights-general-info/42
See the “42” at the end of the URL?
LED flaslights are the Answer to Life, the Universe, and Everything! 
What’s the recommended method to safely discharge a liion battery prior to disposal? I’m not sure if I’m happy just dropping it into a battery recycling bin if it still has charge in it, and I don’t think I own a light that doesn’t have low-voltage protection.
The easiest way is to connect a resistor between the positive and negative ends. Then just let it sit.
Or put it in a light that has no low voltage protection and let it drain. If you have one.
This supposes that the battery itself is not protected. If it is - the on cell protection will stop the discharge and while the voltage may read 0 or a small amount. The battery will have some charge left.
All the Best, Jeff
Can also just drop it in a glass of water and let it sit if no other options are possible.