Mk1 Ultra 150 Spring & Adjuster Bolt To Suit Henderson Doors. A spring to suit many older doors fitted with early Henderson Ultra gear, found mainly on custom-built door panels. These springs are easily identified either by size or by the adjuster bolt, which has a hexagonal head as opposed to a hook. The spring has 82 coils with a length over coils of 520mm (20 1/2"), and an outside diameter of 48mm (1 7/8").
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