I've thought a lot about an adjustable bench where the adjustment is done with a jack, and have a question about the use of one jack to adjust it. A single jack would have to be placed in the middle in order to somewhat balance the load. Once you adjust it, it seems that you'd have to lock the adjustment mechanism in some way to keep the top from rocking (because of the single jack point). Do these jack adjustable benches require you to lock the bench after doing the adjustment?
Or are they stable enough for use on the jack?
I've never seen one of the commercial products to see how they do it.
Mike
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