Actually, the before and after is the same for me. I can't really tell that there's a hole there, because it's very minuscule.
I just used a staple and pushed it carefully through the middle of the hole and, lo and behold, it popped out the other side, along with a little white gunk (not sure if that was blocking it or part of the port). But anyway, after doing that, I pulled it back out and the hole sort of closed up again back to its original state.
It might be nothing, but the bass seemed stronger after I had done it.