When I was Drilling we used to use the PIN to Pap measurements to get the ball reaction and then take out the excessive weight with a balance hole to make the ball legal.THEY STARTED USEING WEIGHT HOLES WHEN I WAS STILL DRILLING EQUIPMENT IN THE 70'S. IT WASNT TO MAKE THEM LEGAL, IT WAS TO MAKE THEM STRONGER ON THE BACK END. MADE THEM ROLL UP HARDER TO FINISH STRONGER AND IMPACTING THE PINS AT A BETTER ANGLE. THEN AXIS WEIGHT CAME OUT. THEN IT JUST WENT NUTS FROM THERE. BUT STILL, WITH THE ONE AWARD PER LIFETIME NOW, DONT KNOW WHY THE BIG PUSH. SEEMS TO ME HIGHER SCORES WOULD GET MORE ATTENTION FOR NON BOWLERS.