There is only 1 certified pro-shop that isn't a long drive away. Ironically, one person I went to, used to work there for years, so I'm not too sure about that.
Just going over this article from Ron Clifton: http://www.bowl4fun.com/ron/btm05_files/btm5.htm
I highlight this section:
1. Locate the two creases at your finger joints and mark a line in the middle between the two as shown in photo.
2. Set your ball on a table, fully insert your thumb and lay your fingers across the holes and stretch them pretty taught, then relax the hand.
3. Once the hand is relaxed the line you drew between the two creases should fall within one eighth of an inch to the edge of each fingerhole.
He says twice to relax a hand. But now I have 3 drillers who stretch out fingers are far as they go. Why do pro shop people not know basic information available online? This I believe is the number 1 cause of poor drilling. As far as where the crease lines up, I believe this is a valid way to check span, but not if pro-shop people stretch out or push back the fingers to make it line up properly!
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