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We are capturing the ball using a vacuum lifting the ball so that our arm is slightly below the rack and firing the ball over using two back to back 3/4 inch bore by 10 inch stroke cylinders we've had success with shorter stroke but we want to be sure we get it over so we opted for the longest ones. The funny thing is the 3/4's extend way faster than the 1&1/2's and the ball really doesn't require that kind of force so we get a pretty good shot out of it.