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Custom torsion springs for self-storage and mini warehouse doors — built to order in the USA, to your measurements. Can't return them once they're wound, so take your time on the specs. Count 10 coils and then 20 for wire size, get the ID to the nearest sixteenth, and measure the full spring unwound. If it snapped, push the pieces together first. Available in common inside diameters for standard storage door heights. Right specs mean a door that actually balances and holds up through heavy daily traffic.
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