A couple of carabiners can.
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Do not try to remove the extension spring that is not broken when the garage door is closed.
Double garage doors with overhead springs use torsion springs mounted to a central bracket in the middle of the door and can be used to help you understand the general principles for replacing garage door springs.
For instance your garage door may operate with extension springs tension springs or a combination of both.
A pair of new springs cost about 25.
One cable attaches to the bottom of the door runs up and over the pulley above the door and around the spring pulley and then attaches to the door track bracket.
Replacing garage door extension spring safety cable.
Since extension springs are determined by how much weight they each lift and the pulley system cuts this in half you need to replace your old springs with 200 pound extension springs.
Home owners can replace an extension springs safely by following these steps.
Doors with extension springs have two sets of pulleys which are sometimes called sheaves.
The doors with two springs are easy to replace.