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if they do have eccentric rings on the objectives you need an optical spanner wrench/ or homemade device to undo the first ring -then you need to turn the rings-as they are not symmetrical they alter the collimation as you turn the rings
having played with this type of bino alignment i found it very difficult to get the rings in the right place -more often than not i made the alignment worse
it requires no screwdrivers
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