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The classic pie-pan/aluminum-ducting torid. The top and bottom are both made of 2 stacked pie pans, for 4 total. I took a roll of Al foil ducting, and used Al tape to secure the ends together.
I pressed the pie pans on top and bottom, then used a threaded rod to hold the whole thing together. The rod has a coupler (like a tall nut) to connect (physically and electrically) to the secondary coil.
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