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<blockquote data-quote="SDMF" data-source="post: 350845" data-attributes="member: 412">Pull the bolt out and see if you can feel the end of the screw sticking through the rear bridge.Did you try spinning the actual base?&nbsp; Pull the scope off and give it a counter-clockwise rap with a smallish nylon or brass hammer.&nbsp; The screw is either broken or stripped obviously, not sure what would hold it on with the rear screw removed.&nbsp; The screws are usually quite a bit softer than the action steel so it's unlikely that you can or have ruined the hole.&nbsp; Might have to run a 6-48 tap in to chase the threads a bit.&nbsp; Worst case would be the gunsmith could open up all the holes to 8x40.Vibration of the scope bases is bad Ju-Ju.&nbsp; More often you see it when someone puts one of the longer screws into the front hole of the front base (or the issued screws are just a bit too long from the manufacturer) and tightens the screw down onto the barrel tenon rather than snugging the head of the screw into it's seat in the base-hole.&nbsp; It'll &quot;feel&quot; tight, but, it's not, causing accuracy to be all over the board.</blockquote>

[QUOTE="SDMF, post: 350845, member: 412"] Pull the bolt out and see if you can feel the end of the screw sticking through the rear bridge. Did you try spinning the actual base? Pull the scope off and give it a counter-clockwise rap with a smallish nylon or brass hammer. The screw is either broken or stripped obviously, not sure what would hold it on with the rear screw removed. The screws are usually quite a bit softer than the action steel so it's unlikely that you can or have ruined the hole. Might have to run a 6-48 tap in to chase the threads a bit. Worst case would be the gunsmith could open up all the holes to 8x40. Vibration of the scope bases is bad Ju-Ju. More often you see it when someone puts one of the longer screws into the front hole of the front base (or the issued screws are just a bit too long from the manufacturer) and tightens the screw down onto the barrel tenon rather than snugging the head of the screw into it's seat in the base-hole. It'll "feel" tight, but, it's not, causing accuracy to be all over the board. [/QUOTE]

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