Hmmm. Are you sure the hole is centered and any sleeves you need are in there? Measure from the center hole out to the edges and see if it's the same all 'round.
If the wheel is that much out, you could try hanging it from a piece of wire like a clothes hanger. Spin it a number of times and mark the bottom each tim it stops - this might tell you what part is heaviest. Then maybe trim it with scissors...
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