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Place a piece of 3/4" plywood on your drill press table.Clamp it down. Use hole saw to create a 2"-ish hole. Change bit to one to use to get through ball. Place ball in hole you just made. Drill. If you can go all the way through you have a perfect axis hole. If not, double up your plywood. After you create your hole in the first sheet create a hole equal to the size of the ball hole in the next. After you drill your hole half way through ball. Put qa matching dowel in the second sheet hole, then place the ball back in the hole with the dowel inside your ball hole. Continue drilling