Garage Door Springs
How to replace garage door spring
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Heavy duty (10000 cycles) extension springs have double loop ends for extra durability. 5 sizes will replace most all spring configurations on residential doors that are no higher than 7 feet. 1/8 inch galvanized carbon steel aircraft cable installed through springs to prevent injury in case of breakage.
Prime-Line 25 in. L 150 lb. Garage Door Extension Spring
Clopay EZ-Set Torsion Conversion Kit for 9 ft. x 7 ft. Garage Doors 134 lbs. - 155 lbs.
The Home Depot