If you only replace the broken spring your old spring will be weaker as it will have lost some of its pull.
Old style garage door spring replacement.
A pair of new springs cost about 25.
If you have two springs on each side of your door and only replace one broken spring you can run into more problems.
If the door remains in place the replacement was a.
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Doors with extension springs have two sets of pulleys which are sometimes called sheaves.
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.
Lubricate the spring with garage door lubricant then remove the clamp from the garage door.
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.
A couple of carabiners can.
As a result you may run into balance issues if you only replace one spring.
The doors with two springs are easy to replace.