Okay this is the old pinup / pindown discussion, which can turn into a big discussion. Because Pinup/pindown is considered out dated thinking since the advent of the dual angle layout system. Though there is a slight come back if you look at the Radical symmetrical ball layouts which is based on pin up/ pin down.
Take a look at the Lanemasters drill sheet here, it shows how the Pinup / Pindown system is supposed to work:
Click here for the Lanemasters drill sheet
The basic idea though is,
The higher above the fingers the longer the ball is supposed to go.
Below the fingers the earlier the ball is supposed to roll.
The farther right the pin goes, the more the ball hooks. Until it reaches the leverage point (which is 3 3/8" from the PAP) which produces max hook. When you pass the leverage point the ball starts hooking less.
A Pin between the fingers, typically voids your warranty and the bridge will crack out. You don't put a pin right between the fingers.
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