Took mine off today and noticed one side is loose and allowed to slide to alter the the width of the rails when attached. Should that side be kept loose or is it supposed to be tightened up once mounted.
I don't know the answer for sure, but I can confirm that mine are the same way and I never had any problems. I didn't notice until I removed them so I never tried tightening.
I don't see why you'd need to tighten it down... With the flex that happens when you put heavy stuff on the bars, it's probably worth leaving it loose anyways.
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