Quote:
Originally Posted by TheVillageChicken
Wrong approach. The wheels are designed to roll in the tracks, not slide in them.
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Wrong. They roll on the horizontal sections, across the top, but when they get to the curved sections, which I alluded to, the wheels press against the track, putting pressure on both the wheels and their axles. The pressure, which causes wear on the axles over time, is lessened if the track is lubricated.
This is true both as the door goes up and as it goes down.