They all depend on seeing the oil rings, Make sure you clean the ball off real good before you throw it. And throw it close the middle of the lane where there's the most oil.
there's the hit or miss method just take a guess about where you think it might be. put a dot of tape right there, throw it see how far off you are, then move it a little and keep trying till you hit it. You'll know your on it when you throw the ball and the dot stays stable on that spot. Through the front part of the lane.
If you don't have a spinner or armadillo or prosect(quarter scale), if your careful you can use a flexible ruler.
How to find a bowler's PAP, ball speed, rev rate, axis rotation and axis tilt from Powerhouse
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