{
  "schema": "front-caliper-casting-evidence-v1",
  "date": "2026-10-27",
  "primary_supplier_page": "https://rimmerbros.com/Item--i-17H9439",
  "primary_supplier_image": "https://rimmerbros.com/ItemImages/Large/17H9439.JPG",
  "image_sha256": "9b65a985c3135e20ca639f17af94e41233b46399381ea5acb0d3aa0605da5a50",
  "read_scope": "Supplier product photograph visually inspected. Raised circular piston-boss form on a recessed broad side web,rounded bridge/body and mounting-ear outline support replacing the rectangular slab construction;not a calibrated profile trace.",
  "supplier_application": "Rimmer17H9439listed as RH front new replacement for Midget1500;not identified as the actual fitted component. Promotional overview claims about different brakes/standard servo were not used.",
  "geometry_decision": {
    "primary_supplier_page": "https://rimmerbros.com/Item--i-17H9439",
    "primary_supplier_image": "https://rimmerbros.com/ItemImages/Large/17H9439.JPG",
    "supplier_comparison": "New RH17H9439replacement;not identified as the fitted casting. LH is a mirrored construction comparison.",
    "photo_observation": "Raised broad circular piston-boss form on a recessed side web,rounded body/bridge transitions and rounded two-ear mounting outline instead of sharp rectangular slab and pad corners.",
    "retained": "Complete exterior bounds,piston/bore and pad stations,two mounting axes/axial faces,retaining pins,inlet/bleeder axes,all other28source mesh records and all body/wheel/rotor/upright poses.",
    "estimates": {
      "side_yz_corner_radius_mm": 12,
      "bridge_yz_corner_radius_mm": 6,
      "mount_ear_yz_corner_radius_mm": 8,
      "side_web_axial_bounds_from_disc_center_abs_mm": [
        13,
        27
      ],
      "boss_axial_radius_stations_mm": [
        [
          13,
          22
        ],
        [
          27,
          22
        ],
        [
          30,
          21.8
        ],
        [
          33,
          20
        ]
      ],
      "port_blend_radius_mm": 7
    },
    "limits": "Exterior contours and side-web sections change. Radii,web recession,boss crown,port/ear blends and mirrored outline are construction estimates from an unscaled replacement photograph,not traced factory sections or fitted measurements. Existing bore,bridge-window and all port/mount maps remain unverified references. No hydraulic passage,wall-gauge specification,casting split joint,pressure capacity,strength,piston travel,seal compression,loaded clearance,overhaul or replacement procedure is established."
  },
  "factory_role_source": "https://www.spridgets.de/downloads/Parts-1977.pdf#page=143",
  "owner_scope": "Existing owner underbody photos provide wheel/suspension context but no identified disassembled caliper section. No new owner measurements applied.",
  "limits": "Corner radii,handed symmetry and hidden casting surfaces remain estimates. No new fluid channel,seal seat,pressure capacity,loaded clearance or service procedure inferred."
}