found it!
James,
After raking around in the garage, I found a 53.5cm length of seamless tubing It has an 20.12mm outside diameter, 14.6mm inside diameter and wall thickness of 2.71mm approx ( measured with my cheapo digital calipers! )
It is the other bit left of the one metre length I bought, slightly longer than the bit I've used.
I slightly skimmed the smooth ends of the splined shaft so that the ends slid in nice and tight, although they would paper down with a bit of effort.
Let me know if you are interested, Dave.
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