Generally how much weight does it remove? In a 16lbs ball, how much difference can one one tell between a ball that has one, and one that does not? Most of what I throw has the extra hole but when I use one that does not it seems heavier by feel. I just wondered if it should be something you can feel. To answer the question yes each ball is 16 before the x hole. Thanks for the info.

azus, I understand there is a few ounces here and there in weight. Would a bowler, who bowls often, feel 3oz in a ball? My x hole size 3/4" by 1 7/8" if that would help.

Thanks guys....