i don't use a spare ball at all and is bowl with a columbia 300 freeze and a brunswick c-system 4.5. the freeze is really close to the slingshot and i use it for ten pins. I just move one dot to the left on the approach (right handed) and throw it a little harder and with my palm at the pin. i hope that helps save the money and get an other ball besides a spare ball. the c-system 4.5 is a steal on bowlingball.com right now just saying lol
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