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Making the mould for the top "dome" of the UFO from "Isopon" car filler over a polyurethane foam former.
At over 8" in diameter, the top dome was too big to "turn" on the lathe, so I stuck it to my bench sander with doulble sided tape and sanded it smooth this way
Casualties of the moulding process! It took me 3 goes to get the bottom "dome" moulded without breaking the "Perspex"!
The supports for the "paddles" can be seen lying beside 3 that are stuck in place on the central hub. (Note the 2 clear moulded "domes" in the background).



