Thnx @welshblue... I really liked @pyrochild 'Grid Warp' plugin, but it was very fiddly even with small grid sizes (though I didn't get down to 20x20)! As you say, with mouse and keyboard support (esp. up, down, left, right arrows) I think it would be even easier! It would also be good if the plugin allowed movement in only one direction, that is, vertically or horizontally so that I could 'uncurl' in one direction only. Don't want to destroy my soul at all if possible!! 😁