For training, a piece of tape on the PAP will show you how the ball revs up and how it changes its rotational axis as it goes down the lane. In fact, if you place another piece of tape on the PSA (the mass bias), the ball should stabilize on this tape as it enters the pins.
Another favorite tape position is above the finger holes - it makes checking revs in the front part of the lane easier, especially when you videotape yourself.
For this purpose, I like to put a piece of painter's masking tape (1" wide) from outside of the finger holes across the PAP, adding 2" in length, and then placing another piece of 3" length right across, on the PAP. This gives a highly visible marking in a safe surface zone on the ball, where the track won't reach it - but simple bowling tape will nromally be enough when placed properly on the right spots.
In tournament, the application of anything foreign like tape on the ball is forbidden - unless you make an engraving or have a weight hole that sticks out.
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DizzyFugu - Reporting from Germany
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