​Hello Jerry;To balance an aluminum spinner, you will want to permanently mark the spinner either on the inside or on the outside, so that you will always assemble it back the same way when changing out props. Put the spinner on your balancer and mark the low spot on the back of the spinner plate. Take the marked back plate and if you have a drill press, drill small dimples on the back of the spinner plate until balanced. It usually doesn't take more than a dimple or two, sometime three to balance the spinner. Of course a regular drill works too, just not as refined. This is the way I was taught, and like everything, there is probably more then one way to balance a spinner. ​​Just a suggestion on the prop, this same technique works for it too. Especially the carbon fiber props. Drilling the back of the hub area. I never add to a prop. I am now sure we are going to get into a discussion on prop balancing too. I personally sand the back of the prop for a wood prop, so as to not change the airfoil and drill dimples in a carbon fiber prop, . Never sand the tip, leading or trailing edges. Again, everyone does it different, and not everyone uses a correct procedure.