{
  "factory_parts_sources": [
    "https://www.spridgets.de/downloads/Parts-1977.pdf#page=79",
    "https://www.spridgets.de/downloads/Parts-1977.pdf#page=81"
  ],
  "factory_workshop_source": "https://www.spridgets.de/downloads/Midget%201500%20WH%20Teil%203.pdf#page=30",
  "factory_workshop_operation": "33.25.10; printed p134",
  "fixing_count": 5,
  "ordinary_bolt_role": "HU909 x4 comparison",
  "bottom_bolt_role": "156336 x1 comparison",
  "bottom_copper_washer_role": "500464 x1 comparison",
  "estimated_fixing_axes_xy_mm": [
    [
      -65.0,
      -55.0
    ],
    [
      -65.0,
      55.0
    ],
    [
      65.0,
      -55.0
    ],
    [
      65.0,
      55.0
    ],
    [
      0.0,
      -134.0
    ]
  ],
  "estimated_preload_spring_axes_xy_mm": [
    [
      1.102182119232618e-15,
      -67.0
    ],
    [
      -15.588457268119894,
      -94.0
    ],
    [
      15.58845726811989,
      -94.0
    ]
  ],
  "estimated_spring_z_bounds_mm": [
    275.86666666666673,
    288.66666666666674
  ],
  "estimated_case_pocket_radius_mm": 3.2,
  "estimated_washer_z_bounds_mm": [
    273.86666666666673,
    275.86666666666673
  ],
  "estimated_washer_radii_mm": [
    25.0,
    8.2
  ],
  "owner_dimensions_applied": false,
  "limits": "Factory establishes five housing-to-case bolts, bottom copper washer and three laygear preload springs; the gearbox key identifies a front thrust washer. Existing four bolt axes stay; the fifth bottom axis, spring circle, pockets, journal extension, washer dimensions, all spring dimensions/turns and displayed end planes are construction estimates. The coil span is not an actual free or compressed length, rate, preload or endfloat setting. Threads, seal loading, oil retention, fitted identity and safe replacement path remain unverified.",
  "baseline_commit": "91dcfaeb",
  "classification": "factory_role_and_count_with_estimated_joint_geometry",
  "source_reading": {
    "workshop": "AKM4071/B printed p134,33.25.10; visually checked scan page30",
    "gearbox_drawing": "Printed pp138\u2013139, scan pages34\u201335; visually checked",
    "parts": "Factory Parts-1977 pp79/81, selected plates read"
  },
  "estimated_laygear_front_journal_extension_mm": 30.86666666666673,
  "original_four_bolt_axes_held": true,
  "case_housing_body_poses_held": true,
  "procedure_scope": "Shared housing operation establishes a gearbox-removal prerequisite and internal release order. It is not a complete1975 North American engine/gearbox removal procedure or an actual-car withdrawal-path verification."
}