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[Mortimer]

I think the drilling of the hole came from baseball bats ?

That's my understanding too. HCB are based in Huntingdon and there used to be a huge American Air Force base near there. The baseball players from there came to HCB to have their baseball bats modified and ideas for cricket bats developed.

[Bulldog Cricket]

I thought so. It was not only to reduce the weight but also for performance purposes. I think it has now been made illegal in baseball bats for that reason ?

[tim2000s]

I believe that corking was made illegal, but there is basically no evidence that it actually affects performance.

[Bulldog Cricket]

Yes corking or just leaving the hole is illegal in baseball.

Good piece on it here where they did measure some enhance performance.

http://www.faqs.org/sports-science/A-Ba-and-timeline/Baseball-Bats-Sweet-Spots-and-Tampering.html