Hello Corey,
Thank you contacting us. It sounds like the finger hole might be drilled close to the filler (or riser) pin. There is sometimes a small gap between the filler and the core that can look like a small hole. It won't hurt anything or the ball at all. Pretty much every bowling ball has this, normally you just can't see it!
As for the core in the ball, it has an inner core that is solid, but isn't quite like the heavier bowling balls. It is challenging to create a "core shape" and keep the ball a lighter weight ball. The cores of todays bowling balls are dense and heavy. To do that with a #10 would mean you would have a paper thin cover. This isn't exactly a great combo as the cover would give up pretty quickly.
This is a picture of what our #10 and #11s look like. We do offset the inner core to create topweight and give the ball some dynamics and versatility.
Please let me know if you have any other questions about this, or any of our other products.
Thank you and best regards,
RaeMe Schnebelt
Customer Service Supervisor
Consumer Products
Brunswick Bowling Products
(231) 725-3376 Office
(920) 907-2702 Fax
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