I had thought of a urethane ball as well...but I don't have one available to utilize, nor do we have one at the shop.
They are doing the lanes starting tomorrow so I will get a practice session in on Thurdays. Even though it will be the house shot it should show me a few things. Maybe I'll just take out an old plastic ball and sand it down. I remember Ritchie Allen doing this a few years back at the T.O.C. and he had a GREAT look with it.
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-Chris: DJ's Pro Shop : Auburn, MA