Right final bit to this new noid arrived, cheers Dave
- but same problem
so working backwards gave it a go with the old manifold which was tricky as the original screws were not in the allen key set they were 3/64 so I had to get a separate key for them. Thats probably why the heads of the screws are sitting proud in the last photo (they were tight though) they weren't countersunk flush like these little ones. Gassed up and phew no leaks if it holds up it probably means the issue was with the manifold all along.
It also means both noids are probably fine