Quoted: how tight does it need to be? Is there is such a thing as tightening it too tight?
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I would think that if you tightened it too much you might dent the rails in, so I would be careful. I don't have mine super tight, but just enough that I can un-do the levers with my fingers and not have to use any tool.
Another thing to keep in mind is that the mount is designed to have some tolerance between the cross bars on the bottom of the mount and the slots in the top of your rail. This means that there is a little play. If you set the mount on top of your rail you can push it forward and backwards and feel just a slight movement. This is to compensate for the tolerances allowed between rails.
So, what I do is always push the mount forward as I lock the levers down. Anytime you remove the mount and then put it back on make sure that you do it the exact same way. Otherwise I'd imagine that your zero might be off more than 1/4" MOA.