If you are willing / able to machine a “V” into the edge of the turret plate, you could replace these bearing stacks with V-groove bearings. These bearings can carry the radial loads as well as the thrust loads needed to react the “tipping” moments of the mechanism mounted to the turret. I have seen some designs recently that use these style bearings but a quick search I was not able to find a few of the pictures of them that I was looking for.
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