Big col, that wasn't it.
The expanda bed end hoop, comes from factory on the inside of the bracket. The hoop can be moved to the outside of the bracket allowing the hoop to easily lower ontop of the mattress for folding.
My mattress doesn't fit inside the hoop when folded so is under pressure when folded, which isnt good. I need to pull the bracket apart, redrill holes in the hoop support and move the hoop to the outside of the brackets.
Hope this makes sense