Given the two cast standards and 6 bare cylinders - everything else is scratchbuilt.
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Nice! did you have drawings to work to?
No - all done from pictures on the net and also knowing bore and stroke from the net.
I now know these are ISIS engines not Puffins . Apparently ISIS were the model before the Puffin having lost wax pedestal as opposed to Puffin ones which were milled brass ones.
I have located a new Cheddar ISIS kit of parts with drawing so it will be interesting to compare.