If you have one of these in your parts box, I would love to buy it and save the wait time from China! I do not need brass or 3mm thickness, but gotta have the 1mm thread pitch and 21.6mm diameter.
Material: Brass
External diameter: 21.6mm
Inner diameter: 13.5mm
Thickness: 3mm
Thread Spacing: 1mm
Can’t help ya! Since its so cheap why don’t you just order it?
Mystery solved……. 
For the price I would’ve ordered it just in case nobody helps out.
Hello friend. I believe I have one. I will confirm later today. PM your address and I will try to get it sent out before the end of the day or maybe tomorrow morning.