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Here are some photos of a dado plane made by Chapin to give you a comparison. Notice how the front blade (nicker) is different from yours. It doesn’t matter that these blades do not line up with the sole. What matters is that the nicker and blade line up. The sole is like the skate on a grooving plane and just determines the depth of cut, giving the plane something to ride on. Looking at my photos, I think my nicker is in backwards, given the way it is sharpened. If you address these things on your plane, it might do some useful work. On the other hand, I’ve pretty much never used mine and just chop them the way Paul taught us. A plane cuts what it cuts, but a knife and chisel cuts exactly what you need, even if slower.