Had to find the center of mass of one of my rifles – forgot to account for a can, so I had to do it again. Why? Bought one of these. And the ballhead and tripod they work with. Can’t wait to try it out in 2013. For a more practical use, I’ve been loving how easy it is to use with my camera; squeeze the grip, re-point the camera, take a picture. Very nice, no fiddly little knobs and stuff to mess with.