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Now that's a tricky little problem. It looks more pear shape than egg shape in that the change in the radius of curvature is not even throughout. Without seeing what's going on inside I was wondering if packing some of the rollers away from the dome might help, so that at least the radius to the roller mountings would be equal and not worry about the pear shape dome. Unless of course if the dome is actually rubbing on the outside walls creating drag.
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