Hello,I am a slow throwing lefty who wants a medium arc.I recently purchased a storm shift.I am going to get this one done fingertip style.I recently did this with a new spare ball and found it to my liking and about 20 extra pins.The man who drills my balls always ask before drilling. Straight ball are  easy theres nothing to say.I have never had a aggressive finger tip ball. If he does ask ,I am not sure what to say.Could someone please give me some info.