Just picked up a used pair of Meopta 15x56 HD's. I've really been enjoying them, but for one thing, the IPD adjustment/hinge is a little loose. They sometimes won't stay set when I let go of them on the tripod. Does anyone know how to tighten this up? If I screw in the threaded tripod adapter will it tighten things up? I am sure I can send them in and Meopta would take care of it, but thought I would check and see if I was overlooking something easy and that would allow me to keep them in hand. Thanks!