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It looks like a spring-loaded finderscope mount as used on many scopes. There are two adjustment screws that allow you to apply pressure to the fiinderscope housing at two points on the periphery - and that pressure is opposed by the spring-loaded third side which lets you adjust the angle of the finder which swivels around an O-ringed pivot at the front end. Is the O-ring seated properly between the finder housing and the mount housing? Is the tension on the opposing spring strong enough to hold position after adjustment? I've found that by sticking a self-adhesive felt pad on the end of the spring-loaded surface it gives better tension.
I usually find that I have to do a minor adjustment every time I go to an observing site by aiming the scope at a distant terrestrial object (such as the peak of a house roof, or the tip of a flag pole or something) and then after centering the object in the eyepiece, I align the crosshairs of the finder to the same part of the object. That sets me up for the evening's viewing.
I also uncap the finder prior to this setup so that the alignment isn't bumped by that action, and remove the finder from the OTA when I'm done.
Cheers
Chris
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