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Hello! How would you attempt to mill an elyptical 'hole' without a CNC? I know the 'pantograph' or 'copy' method. I'm interested in milling this shape using a conventional mill. Also the question is not limited to a milling machine. Maybe there is a different way? Any ideas are welcome...

12mm bore, 12mm stroke, ci piston, steel liner with 3 intake passages, intake timing governed by a rotor plate. sorry for poor description but i'm using on-screen keybord... more to come. cheers from Poland!!!