Couple other pics where/are too large.
Base screws where red loc tited when I got the gu. But yes I checked and they could not be moved. Ring screws where loose!!! Ring base istill good and tight. So thats the culprit! The rings are Vortex (I believe) they are steel and have six top screws in 1/2” T15 design.
I RTV dabed each ring half and assembled. It wont move again once the silicone sets.
CW