All tips were given in this post.
A cap for a Schraeder valve on a bicycle/car tire. 
I received the ordered parts today, remarkably well packaged, great overall experince. I can’t wait to try them, thank you!
Kiriba, do you happen to have a spacer for a Convoy M1 Quad?
Something like Dale made HERE
I would love to build a quad M1 !
I have made very limited quantity of M1 quad sets. 15 or 20pcs. They were made to fit Khatod optics because some members wanted to test it and I had to choose one host for it. All were sold in the beginning of this year. This is very unpopular mod, sorry, Im not going to make them anymore.
I could probably found some suitable spacer in my stocks, but main part (in difference with Dale’s mods) of my quad kit is ring that holds optics (and allows to make spacer shorter and shelf surface smoother). Now I even dont have material to make it (ring).
The only thing I can offer - I still have several M2 kits and various VG10 kits (all for Carclo optics).
Received your Cu pill for Jaxman Z1. Fits beautifully and arrived in good time. Thanks kriba-ru!
Received my copper S2+ pill and A6 spacer. Ordered on the 3rd, received on the 12th. Thanks a lot kiriba-ru!
I don’t see those in your OP. Any details about the M2 kits? Copper or alu? Do they also have an optic retaining ring or push it flush against the lens? Or do they fit for use without the lens? I think the diameter of the M2 is about right for that.
Copper spacer, aluminium optics ring, made for Carclo quad.
That’s quite the chunk How much do they sell for? Are those rings wide enough to hold the optic without a lens or are they meant to be used with the lens only?
No, you have to use stock glass lenses over tir.
$11.
Wild guess: Zoom head?
Q8 positive driver rings
Ф31.7*Ф24.1*4.5mm
$2/pc
No.
Im not against if this lottery will take longer than I expexted (most future projects are paused cause small demand for stocked parts), so I dont give tips that can make guess easy.
I just want to say that chances will raise if you will use collective brain. All interested supposes mentioned in thread went this way. Amount of information that was already given is more than enough to make right conclutions.
Is it a replacement tail end for a light so that the light can be positioned to tail stand?
You forgot extra ring.
I’m guessing its a drop in. The area for the optic has yet to be machined out. It would be useful to swap assembled pills quickly.
Change my mind about it being a drop-in since ElecticJelly, already guess that AND because it’s AL rather than CU.
I say replacement bezel head, before fins and cutting in two parts for front lens holder.
Ordered an X6 cu spacer, plus Ledil Cute-3SS TIR - and I'm absolutely wrapped with them. I finally got around to fitting the spacer on the weekend. A little bit of finish sanding (as is stated in the description), and the spacer slides in so neatly, it's airtight. Really happy with it - great machining, great tolerances. The packaging was also excellent (arrived in a little plastic box with each part wrapped in foam).
I will be back for more!
Got a custom triple kit for my Convoy X3, it just fits perfectly. Will use a cute-3ss with it. I haven’t modded my light completely, just test fitted the parts. The LEDs still need to arrive, so it will take a little longer until I mod the light and take some pictures.