This will be my first year attending Nationals. I watched the USBC Open kick-off show and most of the ball companies had balls for sale. Do the prices include drilling/inserts/slug? I use tri-grip and Vise IT so I'm not sure if the drillers would be able to accommodate my setup given that they might be using Turbo switch grips or not familiar with tri-grip. Does each company have their own driller or is it done by the pro shop. Any insight would be much appreciated. I will be going up next month to check it out before bowling it later this summer. I'm deciding to either get my balls drilled locally or at the stadium.