Thanx Dean ; I did remove the cap and no thread there( ? missing the insert with thread). I got them second hand locally and The lovely gentleman that runs the camera shop was quite happy to swap them over for a pair that I liked that had thread. But would you believe the mount screw is too large for the other binoculars with thread. The Nice gentleman suggested taking my original ones and seeing if I can get an insert that will take the size of the mount.
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