Finger Position
What he means is that you can change your reaction a little bit by positioning your little finger and or pointer finger in different places.
For example:
Pointer finger stretched out and little finger in against your ring finger will cause the ball to have slightly more axis rotation.
You can even tuck your little finger under for even more.
On the opposite side you can bring your pointer in tight and spread your little to get a little more forward roll.
I generally start with my pointer finger in between in tight and full spread and little finger in tight and make adjustments from there.
The reason I pick this position is because it is pretty much the middle (reaction) of the changes made by these finger adjustments.
I pull my pointer in tight and spread little wide for shooting spares.
Give it a try you may be surprised by the difference it makes.
If you go to Ron Clifton's site
www.bowl4fun.com he has a tip about this very thing I believe he calls it "finger dancing".
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STORMIN1