Hi Pete. You will have to take the tension off the overhead spring.If you look at the bar holding the spring. on the end there is a collar with some hexagon grub screws in there is also some holes to insert a small bar. you will have to loosen the grub screws to allow the collar to spin you need 2 bars to wind the tension on and off a bit like a capstone on a ship.dont let it go it will spin fast an release all the tension. when you ve fitted the cable wind some tension back on the spring until the door is easy to lift. hope this helps.
Raz, March 2010
