There are two balls that the link in question is supposed to take you to. Both are Fired Up's I believe. The pin down ball has a small balance hole in it which should bring it back to legal side weight. The other Fired Up could have been made legal simply by combining a ball with low top weight with a deeper than normal ring finger hole.
I had TPC Player with a short pin that needed side weight removed so since the CG mark was so close to the RF hole the driller just took the hole to a depth more normally used for thumb holes.
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"A word to the wise ain't necessary -- it's the stupid ones that need the advice." Bill Cosby