I have an older pair (8 years old) of Celestron 10X50 binoculars with what looks like a 0.25" screw hole. The closest product on the Celestron website now is this.
I have taken to looking at the moon and planets lately, with the binoculars handheld. I have a photo tripod. I got an Opticron binocular mount (this one) which fits my quick release plate perfectly. It also claims a 0.25" screw.
The problem is the the screw goes in to the hole (behind the little cap with 10X50 on it) and sticks. It goes in quite easily for 2 threads and stops. I've cleaned both, and used a tiny amount of lubricant on both, but with no joy.. Once in the mount does just about hold the binoculars, although they slew readily around the axis of the screw.