JC,
Mine is 5 1/2 x 4 1/2, pin above the bridge, and CG kicked right, slightly past ring. No weight hole was needed, and this ball goes long ans snaps on the back. It would be easier to give you more info, IF you would enter a profile as to you style, revs, and speed etc...
Dave
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If You Are Not Using a BuzzSaw, All You Get is SAW-dusted!!