It's not splitting hairs, it's true, the wrist isn't a true hinge joint, it's a planar joint. (hence the double convex) I was using shorthand since I was chatting with Johnny.
I'm in the same position, in that I feel like I can do this to a certain extent, but I've found that if i'm unclear about something in I Liq Chuan, that means I'm not doing it right. Hence the discussion.
I spoke with Sifu just now, and he indicated (assuming I understood correctly) that the center of the ankle does move, either saggitally or horizontally when spiralling, and that the knee moves saggitally.
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