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Put a metal center punch into the vise so it's pointing straight up.
Balance pizza pan on point of center punch. With the rim down, it's very slightly stable.
Hit the pizza pan with a with a ball peen hammer right over the punch.
Seemed like it wouldn't work well, but the pans ended up very well centered in the wheel, and technically you want it balanced by weight, not by shape (although the two are probably close to the same)
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