I don't know how tight to do rings. I just use the short end of an allen wrench finger tight (as tight as I can get them, turning with the short end so there's not too much torque / leverage applied). I use the long end of the wrench for heavy torque / leverage on the base screws. Unlike the rings, as long as they don't strip, it can't be too tight. I always use blue Loctite for all the screws for the base and rings.
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