OK, so having milled out all the centre it needs to be square in the round corners, this was achieved by using a T/C tipped cutter from a saw blade first and then a small HSS square one to finish. Mounted in the four jaw chuck and set at the right height the lathe saddle is moved back and forward like a shaper, with small infeed on cross slide got the job done.
, T/C tipped blade cutter first.
, square one to finish.
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