I never imagined I would ever have more than two balls, well I now have 4! lol
My bag only holds 3 so thats all I can bring, not that I would ever want to take any more than that to league. Of course I sit at home and ponder which ball stays, lol.
I only bowl one league and really don't "need" more than 1 or 2. Since getting back into bowling for the 08/09 season I find that I love to try different equipment. I try to make a change when I feel a change is required, but I think it's more in my head than anything else. If I'm struggling, a ball change sometimes helps give me a different attitude and/or pseudo confidence.
I recently got a C-System 3.5 and if I bowl anywhere near how I bowled with it last week, I may never throw a different ball again, lol.
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Arsenal:
Roto-Grip Cell Pearl (500/4000 abralon)
Lane #1 Chainsaw (2000 + Secret Sauce)
Roto-Grip Cell (2000 abralon)
Brunswick C-System 3.5 (500/4000 siaair)