Rotary Broaching for Asymmetric Hole?

[HopperParticipant @hopper]

The boss being 22mm thick adds a new dimension to the job. Scratch what I said earlier about filing it! I was assuming it was the more usual valve handle thickness of 10mm or less.

Can you find someone with a shaper, slotter or slotting head on a milling machine? That would make short work of such a job, starting with the 12mm drilled hole. Maybe one of the forum shaper owners could help if the job is for a railway volunteer group or whatever?

[Author]

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