I think it's a must to spin test your broadheads. There are several arrow spinners on the market but I just make my own . First I get a board about 18 inches long and make two cuts crossways about a 1/4 inch deep on my table saw near each end. Then I put two washers in each cut so that it forms a "v". Place your arrow on the washers and spin the arrow with your hand. You should place a box at the tip of the broadhead with a dot on the box so that the dot and broadhead are in the same place. If its out of line the tip of the broadhead will not stay in line with the dot as you spin it around. Hope this helps.