50 PCD; 76 corners flush against motor, 2.5mm outboard in 9.5x5.5 slot (width assumed). 3/4 open pillars outer diameter 12mm, M4 bore 4.4mm; nominal radial wall away from opening 3.8mm. Each 90 degree opening faces 22.5 degrees from outward X toward its respective nearby 76mm corner. PCB and magnet positions retain nominal 1mm gap with 0.5mm C shims. M4x20 bolt without a head washer: nominal motor engagement 5.9mm; actual thread depth unknown. minimum pillar/corner distances mm: 0.6463, 0.6463, 0.6463, 0.6463 Estimated material under 7mm head by sampling mm2: 24.00, 24.00, 24.00, 24.00 Positive volume intersections >0.001mm3 for support and shims: none in checked pairs Tool clearance, 7.5mm cylinder: tool0: no checked obstruction tool1: no checked obstruction tool2: no checked obstruction tool3: no checked obstruction