Nice job Dale.
Ike, could be a number of things. Span, hole size, hole shape, pitch, bevel and many combinations of these will cause your friends problem. Just needs to get his grip checked by a good ball driller.
For whatever reason, he is squeezing/bending his thumb inside the hole. Could just be too big, his hand my have shrunk a little due to cold weather, weight loss, diet.....
Hope this helps ya....
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Mike Austin's Precision Pro Shop
Houston, TX
Drilling and Tech Advice BirdDogbowling.com
Driller to many "Stars" and Tony Melendez too!