Mike, to balance the spinner I remove weight. Carefully, do to their pricey nature. I started with an old back plate to experiment first. You can dremmel or drill. On the prop balancer you do the back plate first. I chose to drill a small hole, 1/16" on the heavy side, then enlarged it until it was close. I finished it off with a light shave with the dremmel. When you are happy with the balance on the back plate, which is critical because if the back plate is not balanced then you are wasting your time with the spinner. Next put the spinner and backplate together on the balancer and finish up by shaving the heavy side of the spinner by removing material from the inside of the spinner cone. When properly balanced the back plate and spinner cone do not have to align in any sequence. Regardless of how it is assembled it is balanced. Now this comes into play more so on large diameter spinners. Mine is only 2 1/4 but was out af balance. Its not for everyone and I'm sure to some it doesn't make a difference since its so close to the center. Joe