this ball is a special.. put your favoerite drilling on it, at first you are going to say what was that guy talking about it doesn't do any of the things they said.. this ball needs at least 20-25 games(if not more) put on it to wake it up.. the more you use it the stronger it will be become, not just because you are putting a track on it.. the s75 the way it was fomulated needs the oil in it.. it needs that wake call(slap).. I also would suggest not tweeking or changing the cover on it until you have that 20-25 games on it.. the one thing that I have heard is that after the people have tweeked the ball it never went back to what it was .. really don't change the cover you can bake it to get some of the oil out of it, but that will not be for a while(you will notice the change).. this ball will get stronger and stronger the more you use it.. I have one but have not drilled it yet along with my bounty.. good luck and happy holidays..slashrr69
Ps:
if the two of the balls were drilled the same(nvd,s75), the s75 "will be stronger" then your nvd earlier and more backend..