Anyone used the Spuhr leveling kit like the one in the link below?
http://shop.milehighshooting.com/A-0080-81-Leveling-kit-for-separate-rings-A-0080-81.htm
http://shop.milehighshooting.com/A-0080-81-Leveling-kit-for-separate-rings-A-0080-81.htm