Agroshield
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That tri-lobe centre would cut easily with a mill then a wobble broach.
With the right cutter, you can do a tri-lobe on the gear shaper itself. See page 12 at http://vintagemachinery.org/pubs/detail.aspx?id=3732 .
I wonder how small gears pressbrake1's machine will cut. Could there be a batch of DIY Gamet dial kits (internal 125 and 127 gears) soon on the market?