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Like in most porro prism binos, also in this one, you have to bend the barrels up or down to set the oculars distance, which clearly must be the cause of the hinges bolts getting lose enough to create collimation problems.
I couldn't find any obvious hints suggesting where the collimation screw is located under the barrel protecting rubber. Hugh suggested it may lay behind each barrel panel, where oculars lay on the back side. There are 4 or 5 small screws there.
However, as this binos are nitrogen filled, I would try open it, only if I'm sure that's it the right place.
On other hand, I can't see any out of collimation hints anymore, since I tight those bolts, hence I'm not going to touch those panels and I'm pretty sure the problem is solved.
Possibly I will see Hugh next week (we are going to Brisbane Planetarium, which I never visited yet) and I look forward for his feedback about the collimation problem.
Thanks for the advices.
Giorgio
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