let's start building.
Please tell me of any spelling or measurement mistakes I have made and I will try to fix them.
Don't forget to comment & rate.
Step 1: Forming the ring
to make the ring you'll need something to wrap it around, this should be about 400mm (16inches) as the ring will expand.
I found an old rim the right size but you may need to cut a disc out of wood. once you have your former clamp it to the bench.
As shown in pic 2 put another clamp just away from the former with the rod in between.
as shown in pic 3 slowly pull the rod around, once you have the rod pulled right around and overlapped cut the straight ends off.
use a bar clamp to squeeze the ends together, then weld it together
to finish it off put the ring on the ground and bash it flat.