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That caution was well put. As a young Air Force man one of my duties was to help repair these types of doors (on a much larger scale). I had the proper tool for the job and it slipped. Instant broken wrist, and a sprained ankle from fallling off the ladder. Not fun. These tools were 1" diameter steel rods-about 3' long.
After it broke my wrist, it continued on it's cycle and bent the rod when it slammed into the framework. Be careful. And find out how many turns of tension you can put on them-both sides need to be even at least.
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