Hi again Rob.
Yes is easier to see what the problem is now. You do need another part that provides the stability, because whatever is attached onto the drawer needs a base wider the hole it is being screwed into.
I checked my two setups again to remember which needed what. I needed a 2" nose on my drawer, and since I already had a Bintel 2"-T2 one I threaded the given ring to it, then the nose could be used - I did that rather than track down an m48-2" nose.
These photos show my set up, but I'm not attaching extension rings as you are, but it may help see possibilities. I've not tried attaching photos here before, so we'll see how this goes.
Ring + nose.
Ring starting to be added to the nose.
Ring in place.
Nose attached to the drawer and diagonal.
You need something similar before whatever extensions you need, but I'm not sure what - it is easy to get muddled between the various possibilities, but hopefully the photos may help.
Barry
[edited - having worked out how to attach photos]