I once owned a Heinie Groh game used bottle bat and over the years the cork had deteriorated in the middle and you could actually hear the fragments of dried up cork rattling around inside the bat. So it was being done in the 1910's as well! I think bat corking is more of a mental thing than anything, you think you have an advantage so you go up there more confident and do better. Just my opinion as a former player as well as a Baseball Historian.
Rhys
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