Pattern Grey Spring (Dolphin) spring to suit Henderson
A pattern spring to suit Henderson single Dolphin doors 2134 x 1981mm (7` x 6` 6″) to 2743 x 2134mm (8` x 7`). double Dolphin 3048mm (10`) to 3810mm (12` 6″) wide. Ultra 100 gear. some pre- Premiere single Merlin. Doric. Regent. Sovereign. Warwick. Lincoln and Gloucester tracked doors. These springs are easily identified either by size or their colour.
The spring has 99 coils with a length over coils of 533mm (21″). and an outside diameter of 38mm (1 1/2″).