Custom Watch-Case Screw-Back Thread, O-Ring Groove & Crown-Tube CAD Compiler

Deterministic NIHS horological fine-pitch buttress/metric thread profile + static axial elastomer crush window (22%..30%) with silicone-grease shear check engine (.step, .dxf, .pdf) built for ETA, Miyota, Seiko Mod, Bergeon — zero-upload ephemeral Wasm RAM execution.

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