{
  "note": "v3: boss O-grid in a 0.6 box; one line y=5.2940 carried from the left wall through the boss (counterbore box bottom); counterbore 5-sector annulus+ring, quads below counterbore and hole 2; hole1/hole2 rings split by a cut from the box corner to the wall point where both holes sit about 45 deg off the wall normal",
  "ops": [
    "RING",
    "BOX",
    "CUT",
    "JUNCTION",
    "NODE-5",
    "OTHER: boss O-grid drawn in region 2; counterbore annulus drawn in region 0"
  ],
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}