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I've attached the picture of the blade plate from the Greenfield 12-32 parts list. If the tips of the plate, where the blades attach, are bent up I'm guessing that will be due to past mishaps such as mowing water pipes. It may be a fairly common thing to happen.

On the 12-32 the wheels are mounted on axle clamps. The axle clamps are driven by Woodruff keys. If yours is the same, it sounds as if you have some serious corrosion involving the axle, the clamp and the key having turned themselves into one large lump. Some penetrating oil (left on it at least overnight, maybe longer) is likely to be the main part of the solution, followed by removing the clamp bolt completely and driving a wedge into the slot so that the clamp expands a bit and breaks free of the axle and key. Don't get carried away with the distance you drive the wedge in or you may damage the clamp, but minor deformation can be corrected by squeezing it in a vice after it's off and cleaned up.