A torsion spring system will be located at the top of the garage door, and an extension spring system will have a spring on each side of the garage door alongside the top track. Unless a safety cable is installed through the middle of an extension spring, it can be very dangerous. When they break, they are more likely to fly through the garage and can damage property or injure an individual. Torsion springs are installed with a torsion tube running through them, and when they break, they will stay in place.