A pair of new springs cost about 25.
Youtube replace garage door extension springs.
There are two types of garage door springs.
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.
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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.
One at the end of each spring and one at the top of the vertical door track they also have two cables on each side.
Do not try to remove the extension spring that is not broken when the garage door is closed.
For instance your garage door may operate with extension springs tension springs or a combination of both.
The doors with two springs are easy to replace.
Doors with extension springs have two sets of pulleys which are sometimes called sheaves.
A couple of carabiners can.
Home owners can replace an extension springs safely by following these steps.