“Tweak” chase back to square????

Does anyone know if a Windmill chase can be “tweaked” back into square??? The inside diagonal measurements are top right to lower left = 17.25”, top left to lower right = 17.0625”
Any help would be great!!

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Probably need a machine shop but if your bottom(front lay side) and the right(side guide) are at 90 then your quoins will take up the difference. One of mine has a similar defect but it’s 90 at bottom right corner so no problem.