Thanks Viktor. i think you nailed it. That second ring did fall out and I just put it back without thinking about the position. I did however eventually just secure the lens with some paper tape and it seems to work. Cant get very sharp focus, which sounds like an issue from the elements touching. I took a few shots and will put them up for you to see.
I’ll try to reassemble as you suggested and see if I can get the focus a bit sharper.