I purchased a football “Cowboy Collar” which I think will be a good way to mount and carry the glass sphere. Unfortunately, I got excited when it arrived, and put it inside the hole in my (previously cracked) sphere before I used epoxy putty to reinforce the rim. Digression: An egg is quite strong to pressure applied to the outside. To break it, you want to create a crack in the shell, and pull the crack apart. This is exactly what I did by sawing a hole in the bottom of my sphere, and then placing a (slightly compressed) cowboy collar inside of it. CREAK! The linear crack I had created when cleaning up the edge of the cut with the tile saw extended itself all the way to the other side of the sphere. At this point, I was considering switching my costume to that of Mysterio in Friendly Neighborhood Spider-Man #11-13, where his sphere gets cracked. 
After searching the Internet for more glass spheres, I finally called the Pottery Barn main telephone number and was told the item (SKU number 702 1991) had been discontinued and it was not available for order over the Internet or phone. But she did mention that one of their stores still had some stock, and it turned out to be in Atlanta!
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