Problem sorted & Good response from...
Latest update & fix.
Arnotts offered to replace my front airsprings, thought they still reckon the clips are superfluous in normal running....
Anyway, Son #1 visited... and with the eternal optimism of youth, along with lots of brute force...as well as a very nice air-operated die-grinder being wafted near the axle mounts.... we managed to get the pins through far enough to mount the clips.
All is now well with the EH, and the ride, in highly technical terms is.. "Nicer" though difficult to explain exactly 'why'.
And very impressed with the fold at Arnotts, especially as they were so eager to replace the pair... - Seeing that they were so helpful (being a day behind us is a pain!) I reckoned we could make one last heroic attempt to save them/us the pain of two-way shipping.
...Its very nice to see the car remain inflated overnight!!!
Now to build in the 'Emergency Fill Valves' and mount them (neatly!) on the vehicle.
To be sure to be sure, I'm going to have an in-line tap between the valve-body black box and the Tee-Piece that splits to the airspring and Schrader valve. This will enable total isolation of the Black Box from each corner, should it fail catastrophically.
Happier James in Perth