I did consider keeping it as a rubbing stone but I wanted that corner supported. If the break had been straight down, I probably would have left it off.

I'll give you one warning about Gorilla Glue--IT EXPANDS. I haven't used it very much and the first time I used it was to glue a coticule and it split the rock. I had it clamped very lightly on both ends and the middle busted out during the night. I SHOULD have clamped it between two boards to ensure uniform pressure and I know that is what I'll do the next time, but just be aware that it continues to expand slightly for quite a while.