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Nothing quite like a photo to show what I am rabbiting about...
Took my own binos out an lift the flap of one side to reveal the collimation grub screw I am talking about. There is a corresponding screw on the other casing.
Now, thinking about Daniel's reply, I do now remember that there are some old bino designs where the collimation screws are accessed via opening the prism casing. This is not an easy method as it means needing to adjust, re-assemble the binos, check, then if still out, re-do the whole process.
Mental.
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