I went up to the Men's Shed this morning, to finally re-grind a plane blade. Over the last couple of years I've been sharpening it solely by hand on the whetstones, and this had brought it out of square by about 1.5 mm. The lateral adjustment of the plane handles that, but it's at its limit and anyway it looks bad having it so wonky. The Shed has a nice sharpening grinder with a water bath and a reasonable tool rest and jig. It's got a little bit of play in it, but not enough to worry about so long as the jig is kept pressed firm in one way or the other while in use. I got it square and good, and will now finish it off on the stones.