I made this about ten years ago with a cheap HF tubing bender. I got the wheels from them as well when they where on sale for $4.99 a piece. Works great, just have not gotten new bottle since I moved. Interestingly enough, the bottles that where in this cart when I lived in PA, where given to someone I knew there. He had a fire in his garage and the bottles detonated (they where 1/2 full). The firemen said it leveled the 2 story 4 car garage, and half of the 5 bedroom house.
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