Reply by Ron Aylor

I did almost the exact same thing putting the uprights into my file till just last week, so the leftovers looked familiar. And I free-handed a backsaw as well. Cutting all the slots for all the files gave me a lot of practice sticking to my line.

Edit to add: the chunks were too thick for a dado plane, which was my first thought, but I’m pretty sure you don’t use one of those very often.

- Dave Polaschek

I had a feeling you would get this one. I find it easier just to chop out the waste with a chisel when cutting dados. I will use a rebate plane on rebates, though.