The arrows and a second target further down lane where possible.
Here's the main problem I see with using the dots at the foul line. The ultimate target (pocket) is too far away. I can can cross the second dot going in any direction, straight, pulling it inside, or missing outside. Does crossing that dot get me to my target? Maybe, maybe not.
I have seen bowler after bowler who say they are looking at the dots (and swear they are going right across them) miss by as much as 5 boards at the arrows! No wonder they can't tell me where their ball was at 15 feet. They're looking down.
Another potential problem that people focused on a target that's straight down (dots) tend to get bent over from the waist too far and have zero leverage at release. In my experience it's a accuracy issue as well as a body mechanics issue (leverage).
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Lane Carter, Strike Zone Pro Shops - Salt Lake City, Utah
Brunswick Amateur Staff