When you get other spheres made let me know, size, price, etc. Just love what's done for you. What size is your tube? Opening size on each of the others? I found another place on line that sells the globes. I'll try to get that info to you maybe tomorrow. Lots of sizes there. I think 6" and up from there. Love your balls. I might try to even do one myself, if I can.
Cool I'd say try it .my tube is a 10 inch but overkill should have gone with the 8 inch the hard part was getting the threads in for coupler but could go a more simple way with just a hole push a hose in and glue it in.
Wanted to get back to you on that website, I mentioned yesterday. Plastic-domes-spheres.com. I asked them to give me a quote on drilling the hole (which they will do---extra) in an 8 or ,10 inch sphere. I have yet to hear back from them. Price of spheres alone isn't bad.