Close. I made the slot with a thin side and face cutter, because that's how the machine was set up at the time, fitted a plain piece of metal with the first bottle of 'strong' Loctite that came to hand. I then shaped the blank by turning the faces and tips in the lathe, and cut the tooth form with an involute cutter because I happened to have one
End milling the slot will work, and so will filing the tooth form if you have no other way of doing it. If you squash a bit of lead sheet against the side of a few good teeth, you will have a profile gauge to use when filing up
Richard