Saddle-Stitch Waxed Thread Length, Leather-Stack Thickness & John James Needle Calculator

Deterministic 3D helical saddle-stitch lock-knot path geometry L = 2 * N * sqrt(pitch^2 + (k_knot * thickness)^2) + two-needle tail allowance engine (.pdf, .json) built for Fil Au Chinois, Ritza 25 Tiger, John James Needles, Vinymo MBT — zero-upload ephemeral Wasm RAM execution.

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