I use both the Delta 13 (for 9-Ball or Ten Ball) and the Diamond rack for full rack games. The Diamond has ample room to get your fingers inside and press the balls in tight. The Delta 13 will give you a tight rack but there is no room to get your fingers in there with a full rack, and adjust it if necessary. You can only adjust or tighten the rack from above with your hands. So when we play One Pocket the Diamond rack comes out. The Delta 13 is a great rack though, probably the next best thing to a magic rack or template. But if you buy one make sure to get the leather sound dampeners. Otherwise the clanking noise when racking will make you want to throw it away. 
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