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Dave, et al,
I repeat the overall shape of the ellipses "look" similar...
But there is a variation (slight) with the superimposed edges...
Marc's CAD comes close - the cylinder section has to be off-set but when this is done, zoom in around the edge - you'll see what I mean.
I'll get the draughting board out and replicate the drawings I did 40 years ago to demonstrate.
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