{
  "schema": "housing-preload-joint-validation-v1",
  "baseline_commit": "91dcfaeb",
  "valid_native_groups": 51,
  "held_mesh_groups": 43,
  "changed_existing_groups": [
    "gearbox_main_case_reference",
    "clutch_hollow_housing_integral_boss_ears_and_pivot_saddles_comparison",
    "clutch_housing_case_uncompressed_gasket_comparison",
    "clutch_five_housing_to_case_screws_and_four_unloaded_washers",
    "gearbox_hollow_stepped_laygear_cluster_comparison"
  ],
  "added_groups": [
    "clutch_bottom_housing_bolt_copper_washer_comparison",
    "gearbox_front_laygear_thrust_washer_comparison",
    "gearbox_three_laygear_preload_spring_comparisons"
  ],
  "five_shared_fixing_axes": true,
  "separate_bottom_copper_washer": true,
  "original_laygear_material_held": true,
  "three_coils_in_shared_case_and_gasket_passages": true,
  "reference_coil_ends_meet_washer_and_housing": true,
  "source_spring_intersections_mm3": {
    "case": 0.0,
    "gasket": 0.0,
    "housing": 0.0,
    "front_washer": 0.0,
    "laygear": 0.0
  },
  "retained_case_and_body_poses": true,
  "held_surrounding_files_sha256": {
    "clutch-pack-reference.json": "fc2a8f546e8736b6a3b35535746ef48781bc8d6e8c6af2b4d366fb8fc930fca2",
    "clutch-pack-reference.step": "e6abec3ae244af24a709c67effd2bb8cabd95d18963fd2a3dc29cbca6b174869",
    "gearbox-controls-reference.json": "8c8e7143a73d7d0747dae76573872d6f687ecf3013f993a1f157dc36d20f13f7",
    "gearbox-controls-reference.step": "50646aa200d096551fba57160b92031e294f3ad86f69f3c5b2bac3872ae99205",
    "rear-power-support-reference.json": "466376cba53b28afb2d1bb2ec4ab605b548479ca8608d1aaf0b490f2e68d366e",
    "rear-power-support-reference.step": "5d0cf6fb02265bd1d68f36928117c0dd832ecbbcdfb852915e7eb13d6c608985"
  },
  "source_sha256": {
    "transmission-reference.json": "4a3419bd13e91e24f31db8887982484adf5108ba32b1ba162e7f82010d620f8b",
    "transmission-reference.step": "e9e963c2773c817befc8532f7451969dff0309607663ec0aad9966465495c328",
    "clutch-release-reference.json": "1d76f85dca33a0d56cc7c44a6ed4b50eef99bf3e8ea1777a2ffda41fb08d0196",
    "clutch-release-reference.step": "3d87920418d1194eb18835223bd821f8c6e8fa8089d4aaffad1ac29fad1fa3e2",
    "gearbox-internals-reference.json": "6d6914a85d0d58fe12abda86dd46cefb77bb61823519a35097de8ee90245d3c3",
    "gearbox-internals-reference.step": "86326c47f8784bd115323b2068c114ed4544157ed6c6f975b1c04982f76bb82c"
  },
  "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. Native coincidence and nonintersection validate this static construction only; they do not establish spring compression, preload, bearing endfloat, loaded seal fit, torque, actual fitted geometry or a replacement path. Existing boot/rod source contact is outside this joint revision."
}