Misalignment in frame - blade wonky, parts grinding

Hi folks, wondered if anyone has any experience mending on of these? Ours fell from a height and that appears to have bent the frame out of shape ever so slightly (one upright bowed), but badly enough to mean the cam is grinding/cathcing on the parts around it and the tool is unusable. We tried taking it all apart, bending in a vice, but no change. Any ideas welcome