Thank folks................ but aside from lock tight in the rings (which is what I am considering with the epoxy) This has bean done over and over again. The base has bean resolved and is no longer a problem. I have tried a one piece mount and ring combo (the DNZ) That has perfect alignment. I always use fresh screws except for the in the field temporary retightening till I get it off the range. I always use a torque driver. Even-incremental tightening is my standard procedure. lapped rings are not mismatched and are properly aligned even though the third (the extra) leupold ring was modified to make it so. Thanks, but still searching for anything new....................Duke