If the wire starts to spin after a few turns you have placed the wrong garage door spring on the shaft.
How to change your garage door spring.
Once you ve completed a quarter turn insert the other bar into a different hole in the cone and let the bar lever against the closed garage door to hold the spring tension.
If your garage door uses only one torsion spring lifting the door manually could be extremely difficult unless you are able to lift between 150 and 300 pounds depending on the weight of the door.
A safety cable is threaded through the spring to.
The bigger hole in the cone goes at the stationary end of the shaft.
This allows you to move the original bar to repeat the process alternating the bars with each quarter turn.
This video will show you how to replace the extension springs on your garage door.
Better yet call a garage door repair person to inspect and repair the door for.
Replace extension garage door springs by following these steps.
Open the garage door to remove all spring tension and clamp it in place.
Slide the new spring onto the shaft.
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Once in place disconnect the garage door.
That said you should only lift the door with a second set of hands.
Check that the wire is tight enough.
Disconnect the spring from the track bracket and the spring pulley.