Whoever built it and whoever QA checked (or forgot) fires both. Sure it's $12, but I'd be hard pressed to find worse craftsmanship. The photos say it all. The levers were so off-center and the spot welds were so off-center, the stance on my bike was so askew (I checked it out). So I broke my arm and bent it to match the other. I then used the Allen screws that came with it. *BIG MISTAKE* All heads fall off in the last round. I would have stopped after the first screw, but my bike was only $200 and I'll just fix this nightmare if/if I ever take the trunk off. You can see in the picture after installation that it looks decent, but it's still slightly off-center. My bike had threaded holes in the dropouts above the axle slot. The supplied screws were screwed in directly. My bike also had Allen bolts on the seatpost just above the seatstays that the included arms attached to. I have a Dawes Streetfighter bike. So I just wanted something to attach my saddlebag to and maybe carry a dozen bagels or so. It's strong enough for that.
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