Concept only. PCD50 and PCD76 phase 45 deg assumed; 4x M4 Ø4. PCD76 slot 9.5 x 5.5 assumed; angle brackets remain flush and shifted 2.00mm outwards. Nominal M4 versus slot-end clearance: 0.75mm. 50 head Ø7 x 3 assumed. 76 washer Ø10x0.8 assumed; M4x8 gives nominal 4.2mm engagement, motor hole depth unknown. 0.5mm shim; 50 foot top 3.5mm; original PCB and magnet position unchanged. Detected positive volumes >0.001mm3: none in checked pairs Tool access, Ø7.5 envelope from z6.51: 50 head 0: clear (model envelope only) 50 head 1: clear (model envelope only) 50 head 2: clear (model envelope only) 50 head 3: clear (model envelope only) 76 head -1,-1: clear (model envelope only) 76 head -1,+1: clear (model envelope only) 76 head +1,-1: clear (model envelope only) 76 head +1,+1: clear (model envelope only) Sampled 50 head contact areas, mm2 (not strength): 17.56, 17.56, 17.56, 17.56