Back to A1 working and ticktyboo
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After spending a day or two trawling the interweb I went for the easy option in the end of just trying rear hub drive searches and was smacked in the face straight away with the answer.
The original design used an already made drive unit the SRAM DUAL DRIVE 11/ 3 X 9 system, which are no longer produced and as of this year Sram no longer make any hub drive /gear units now having ceased all production.
The issue I was experiencing was bearing retainers being worn, internal springs past their sell by date as well as the odd pawl issue. These incidental small parts appear to be hard to find and mostly unavailable.
After looking each evening for the best part of a week on ebay, I found a new unused 3 x 9 dual drive for sale in the UK from a cycle shop delivered to my door for a ton.
Rather then strip, relace and true the rim I decided to just replace all the internals and keep the old hub shell as is.
And blow the crows two more new units have appeared on ebay from German bike shops.
Old internals I removed for cleaning after pawl spring snapped and ceased hub drive up.
The thrust washer far right is cracked and has a hair line on it across the radius also the e-clip is quite weak.
Main pawl carrier.
Hub internal thru pic, small bearing retainer on Lhs was past it's sell by date.