I went to the Cell seminar and decided to drill one up since I like my Domination. I put the pin at 4 1/2" from PAP with the key at 60* and the VAL angle at 75* (pin under). I had to put a hole down the VAL as most pin under layouts do not roll well for me unless I do so.
I see a pretty nice looking motion compared to the Domination. My Domination is 5" from PAP, 45* drilling angle and 40* VAL angle (pin over ring). I usually have no problem getting my Domination to make the corner on house conditions and my Gravity was a little smoother off the spot in comparision.
I think the Gravity will be a nice ball with some versatility.
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Mike Craig-Columbus, OH