With an angle grinder, actually. First cut the outer curve following a template I designed in Inkscape. Then I mounted two fresh cutoff disks in the grinder for extra width, and measuredd that on a test piece. With that I got the angular spacing needed, and made another template with both the radials and an inner circumference to mark the depth. I transferred the marks with a punch and scribe, and then just carefully ground in with the grinder following the guides. A bit of cleaning up with a file and it was done. I'm quite happy with that mechanism, the Kalamazoo desperately needed a lever with a release handle on it. :)
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