Having worked for ebonite in the past, I know exactly what they will tell you:
It is called spider cracking. It comes from using glue and grips. Makes the area around the grips very brittle and creates those cracks very often.
Usually they don't do anything about it. Also that the pin is so close to the fingers that voids all warranties as well.
Where are you from?
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George Palumbo
Mvpbowler300@yahoo.com
Mvpbowler@aim.com
2002 True Amateur Challenge Champion