I placed the 4" sphere on a cutting mat to see that it was 4" and found the 2" center points of it on either side. I ran a piece of stiff florist's wire straight through the ball to come out exactly on the 2" line on the other side. THis is a good way to find the center of the sphere. Another way is to use a measuring tape and measure from the top point to 6 1/4" around to the other side and hopefully find the center of the sphere that way. I am not good doing it that way.
Once the center has been found, I take a black Sharpie pen and mark the styrofoam on the top center and the bottom center and remove the wire piece.
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