Is the hole in the bridge between the fingers? Or, is it just a hole in the bottom of the finger hole?
If it is in the bridge, allowing you to see from one finger hole to the other, it needs to be repaired. If this is it, the lack of support for the bridge could let it crack completely out. If this is it, you can fix it pretty easily by just cleaning out all the loose debris, plugging the fingers and redrilling them in the same spot. If the bridge hasn't already cracked, they may be able to fix it well enough that when you put your grips back in that you can't even see the fix.
--------------------
Good transactions list in my profile
[THIS SPACE FOR RENT]