When the New Defiant Soul first arrived at my door, I was very puzzled on how I was going to drill it. I havent had much success with asym. cores in the past, so i was going to experiment. I drilled it 5x5x1 and was finally able to get a clean smoother roll through the front, with a nice aggressive move down lane. I will definitely drill more asym. core much weaker from now on. Another great addition to the Roto Grip family!

Erik Ramos
Storm/Roto Grip Staffer