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How do you line it up right before tightening?
Let's say the ring is loose and you don't reach infinity (most likely case), you turn the (loose) ring in the other direction (away from the infinity stop) a fair bit and tighten the screws. Then you'll be able to dial past infinity. Now you set the focus exactly at infinity, loosen the screws, then turn the (loose) ring to the infinity stop and tighten the screws again. Done.