Ugh. After numerous hours of Trial and Many Errors, I have finally managed to get a stable Half Persian 3-in-1 chain made.
This weave is particularly tricky because you cannot safely set it down or hold it in whatever way you want, as the weave isn't stable until the point I'm at now.
Moving it the wrong way, dropping it, or setting it down wrong will result in the entire thing falling apart and you'll have to start over.
It involves putting 2 closed rings into 1 open ring, closing that ring, then weaving another open ring into rings 1 and 3, but not 2, the ring you're weaving in will rest against ring 2, then you'll add 1 closed ring, and then close the open ring. You'll repeat this again until the chain is of the desired length.
The biggest issue I was having was that the rings I'm using are of a larger diameter than my other rings, so the weave is overall loose and floppy so far, but this is to accommodate the rings I will be adding to it once I've completed my chain.
This is the beginnings of a different weave I'm attempting called the Cylon weave, which starts out as a Half Persian 3-in-1 and adds other rings.