My view of the universe would be something like
1 be sure the wheels are in line with each other
2 hope the frame is in line with the 4 wheels
3 tweak the sheet metal to fit the wheels
I see the sheet metal with respect to the wheels at the very best will be off just from tolerance stacking, however much more so from pure tolerance in symmetry of the sheet metal
I would assume the 10mm you measured is more of a sheet metal thing and maybe something you could tug/push by hand
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