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I made a jig to cut the dadoes. The jig is two pieces of mdf, one slightly larger than the other. I screwed the two together with the larger piece on the bottom, then using the upper board as a guide trimmed the lower one with a straight bit and collar in the router - thus making the bottom edge match the edge of the bit. I had to finish up with chisels since the two passes with the router didn't come out evenly. I think the reason was that I had the assembly clamped to my workmate and I didn't have anything underneath the workpiece to support it. I'll have to remember that next time.
I did learn an important lesson while making the jig - don't expect the same bit to cut in exactly the same place with the fixed base attached as it does with the plunge base. I learned this the hard way, but was able to solve the problem.
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