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Nice find. Another experimental and slightly cheaper option is a couple savarin molds, from the cookware department. Savarin is a kind of French cake I think, and the molds come in a few varying diameters. You would have a rim around the circumference after buying two, one for a top part and another for the bottom, and it is sort of close to a toroid shape. This one is 9 and 1/4" diameter, seems to be around the upper end on the sizes I saw on a quick google search. If you search there are 5" diameter ones like this for less money. http://www.ebay.com/itm/Harold-Gobel-32oz-Nonstick-Heavy-Aluminum-Deep-Savarin-Baking-Cake-Mold-Pan-2479-/391679016240?hash=item5b31e37d30:g:gX8AAOSw5cNYfceE ---------------------------------- Brian Hall ________________________________ From: Tesla <tesla-bounces@xxxxxxxxxx> on behalf of Terry Oxandale <Toxandale@xxxxxxx> Sent: Monday, March 13, 2017 2:02 PM To: Tesla Coil Mailing List; Futuret Subject: [TCML] Economic small toroid source Just thought I'd pass this on to the group in case nobody has happened on these. They are designed for exhaust systems, but looking at the photos, I would say they provide the next best thing to a spun aluminum toroid. 9" OD, and 3" ID with a secondary (?) diameter of 3". These are SS, so that makes it easier to tack a mounting plate in the middle of the toroid. http://www.ebay.com/itm/Mandrel-Bend-Donut-3-0-3-0in-3in-3-00-3-Exhaust-Intake-Stainless-Steel-Ubend-/350977132953?hash=item51b7de0999:g:hk0AAOSwQJ5URqpO&vxp=mtr Terry This email and any attachments are for the sole use of the intended recipient(s) and may contain confidential information. If you receive this email in error, please notify the sender, delete the original and all copies of the email and destroy any other hard copies of it. _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla Tesla Info Page - Tesla Coil Mailing List<http://www.pupman.com/mailman/listinfo/tesla> www.pupman.com This is the pupman.com tesla coil mailing list. It is now running new list management software, so any differences are likely due to it. To see the collection of ... _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla