I loosened the screw. Now the pin does pivot back and forth, as for it being too loose, I don't know. I loosened it to the point that it will swing back and forth freely. Will my sight still be on vertically(up & down)? I don't think theres a reason for it not to be. I just won't have the time to check it till I go out this Saturday. And I don't want to check it on a deer.