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Hi,
No, use all 3 at first. You first need to determine which one moves the laser dot in the right direction (it may be 2 adjacent screws needed), then tighten one side and loosen the other, just slightly. You should end up with all screws about equally tight, and they don't need much.
For the last little bit you might only use one screw.
You need a system, because doing it at random will drive you crackers. The screws in mine needed an allen key.
Cheers
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