Mjiggalam post is dead on! That is the correct bolt, just “barely” loosen all 4 bolts (all 4 ends). It is like a spring & I guess you unscrewed it too far. The idea is to loosen all 4 @ put one crossbar on the top of the car on one side and go to the other side & pull on the other side to extend it. Basically extend it “beyond” the distance, push it back to lock it in & then tighten both Allen bolts. My only concern is the one screw you cannot put back in. I would focus on the crossbar that the screws/bolts are in place still, just so you can figure out how it operates to extend.Thank you. Your explanation does make a bit more sense. We're having a heatwave and my patience is wearing thin with the Ebay guy who simply will not explain anything to me. He claims the bars are different lengths. I sent him the photo I'm attaching here.
He does claim they are extendable but won't say how to do it. My bars are different than yours. Do you think the allen bolt facing forward at the top left in my photo is the one you're talking about that extends the bar? I can tell there's some kind of spring inside there because I did unscrew one out of curiosity but could not screw it back in. It's behaving as if the hole is too loose for the threads.
I do not have 1 and 2 anywhere on the bars. The only thing is a directional arrow pointing forward and "HR" on both bars. I also have this thing that says "tighten" with a circular arrow. But there's no hole beneath there. It's just an empty hole that says "tighten."
Honestly this should just be so easy has become too complicated.
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Blake