Vertical Sliding Sash-Window Spiral-Balance Torque & Pocket Counterweight Sizer

Deterministic Sash timber + glazing + putty mass integration + counterweight pocket volumetric density & cord-pulley friction balance engine (.dxf, .pdf) built for Caldwell, Mighton, Reddiseals, Unique Balance — zero-upload ephemeral Wasm RAM execution.

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