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yours is an older model japanese bino -they didnt put little screws under the rubber (thats a chinese thing) you had to take it apart from the ep end (the eccentric ring objectives are not that common & limited to a few models-like the early fuji's or some german models)
once apart youll see little screws pushing against the prisms-it is these youll need to tweak
firstly though is it easier to try & ascertain which barrel is the offending one..look thru the bino & swing thru the ipd range -then turn the bino upside down & turn it thru the range again.the barrel which moves against a background object (eg fence) is the offending one
adjusting the correctly aligned prism will likely spell disaster
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