Iso, The $99.99 is what the government suggested for a startup cost, they said the dive industry will steal this Idea and make millions. Then I get 16% Of every one sold, and 8% when resold, like on here or craigslist.
But since your check is in the mail, here is a start for materials and sizes.
Now you get surgical tubbing and rope to fit inside, then use SS fender washers.
Cut the tube in 6" pieces, perfect for most all tank sizes.
Iso don't reveal this as I will send contract first for you to sign and send back, then you will recieve the official plan documents, with a trademark Iron you will melt in foam, I know there is a lot to this DIY Ways, but I have run out of scuba funds, and this will only be a short time before I own the whole dive industry, In ten years I will sell this product for $72.22.
As a bonus if you take two pieces of pvc pipe and tie rope through drilled holes and desired length, set tanks in then bungie over top, connected to pvc.
Thank you sincerely VD inc.