Yes it is Norm, I like the whole design. Very precise and versatile. Will even atomise paraffin to run an engine (if run on petrol first for 20 seconds).
No washers! , all joints are machined tapered fits. Although they were noted for drips, occasional flooding etc, I think if they are carefully cleaned and assembled, they won't do that.
Fortunately, I now have a full copy of (c1926) service instructions for these carbs to work with.
No secrets or magic Nigel. Most of the stuff I use is found under the kitchen sink. Old worn out green scouring pad (softer). Shiny Sink cream cleaner. White vinegar.
Piece of Aluminium for a scraper, old toothbrushes for the outside of carb body. Soft steel/brass wire brushes.
Inside- Thinners for cellulose (acetone), tooth and small inter-dental brushes. Old version 'T' cut. Then put some time and elbow grease into it and wash thoroughly in thinners-