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Normally change both pairs at the same time, a messed up drum can lead to a cable jumping. With our garage door maintenance you prevent premature wear.
These are 11 gauge steel hinges. Cracks form on hinges from continuous usage. This can lead to the sections being damaged by allowing more flexing in the hinge areas.
If these lock-up it could cut the torsion tube allowing for the springs to lose tension potentially causing major damage to the door.
It’s nice to have these on both sides of the garage door to stop people from breaking in and to help in the event of a hurricane from your door being blown in.