Spinning on your hand or a table works pretty good. One of those G5 spin testers with the bearings works really well, too. If you're a cheap redneck like me, you can do well with a small narrow cardboard box. Cut the top off so it looks like a box with no lid. Then cut two v-shaped notches in sides opposite each other. Set your arrow in the notches and spin it with your fingers. You'll see any wobble in the point of the BH if one exists. Another tip, if you're having trouble or questioning the wobble... Before you start spinning, use your eyes to line up the tip of the BH with a line behind it on the table. I like to put a piece of tape down and use the edge of the tape as my line. As you spin the arrow, the tip of that BH should not leave that line, unless it's out of whack of course. I find that using a reference like a line on the table helps to REALLY dial in those BH's that are just ever-so-slightly out of square.