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The large veritas router plane is great in some instances. The blade depth locks. The small one does not have the lock and it tends to move during use. Great purchase on large one Regret purchase on small one!OK, routers. My use is not to cut the dado, but to clean up a dado, finish a stop dado, hinge mortice etc. So, light duty use. I think the small size simple ones would do for dados, but I wonder if the large base is better for cleaning out hinge mortices.
My first inclination is just a small bent neck chisel, but of course, no depth stop.
L-N and Veritas "small" are out of stock. Large are overkill I believe.
The Cowryman is an interesting tool. For one thing, the blade is like a chisel in you can pull it out and sharpen conventionally, but it is not a "foot" . Basically a chisel in a holder.
Like a lot of tools, most are out of stock.