I have had quite a few symmetric balls. Asymmetric not so much. My favorite drill for the lane conditions I now face is 120 X 6&1/4 X 40 with a symmetric core. I've always heard that if I drill an asymmetric 6/1/4 pin to pap it will actually hook more than the symmetric. Is this true? What would be an equivalent drill for asymmetric to my favorite symmetric drill? Thanks for any help.  Mike E

This video will help...
http://www.youtube.com/watch?v=v8soXaercu8&list=PLB0F709E848F857D6&index=1&feature=plpp_video

I sincerely appreciate your attempt at helping, but he didn't talk about flare in oil versus flare in dry, and why they are so similar in that pdf.  That is what I am asking about.