We were told a great tip from Peter Barber when we visited last weekend. To cut the De Laval nozzle shape in the graphite rod, a simple way is to create the right angle shape out of a spade drill bit. Grind this down to make up, approx say, 35 degrees. When it is spinning in a lathe, it will neatly cut a perfect nozzle shape into the graphite. Today I ordered a set of spade bits from eBay. Good price.
All about De Laval nozzles here
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