Hopefully there is a digisnap of the ground glass attached to this mesage, but it's the first time I've tried it, so no guarantees. I'm thinking it may have been stressed at a point about 1/3 in from the RHS and 1/4 down, possibly from something jammed hard against it in a bag, but that's just a guess.
While I'm really grateful for your offer to make another one, I can't have you going to that trouble again for me, and you've already done more than anyone would have a right to expect! I still have the original GG, so maybe someone else has a greater need than mine.
Hope this works, Peter