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1

What can suffer on some designs is the cables. They fray and effectively stretch, reducing the assistance from the spring (they can go almost completely slack when the door is shut). The good news is they're not hard to replace.


2

No, they don't measurably stretch. The reason is that, by design, the springs are not extended beyond their elastic limit at any point in the open/close cycle. The amount of "annealing" that takes place over your lifetime is too small to worry about -- or measure.



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