where to buy ei cores for ot and pt

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I live in Seattle. I have a couple 100w trannies and 300w trannies I need to build. I haven't figured out exact tongue size yet due to limited sizes available that I have seen so far.

Theoretically to get it to be closest to square I would need tongue sizes of 72 mm and 55 mm. That's based off calculations for proportions of a waste-less core.
 
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