Illinois 6506 - Help fixing a nick and cupping

[rickboone]

I was gifted this lovely Vintage piece a while back. It really has been my go to strop for quite a while. I think its size and slickness have won me over. Well, I was playing with a blasted Gold Dollar and of all things...this is what nicked the strop! I was working on my stroke with not using my wrist and whammo. I can't wait until the next meet in my area so I can see first hand how to correct some of my mistakes. Meanwhile, is there a better way other than my non-working superglue to fix this? The superglue is what made the dark mark.

While I'm at it, how do I get rid of the cupping?