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I'm a journeyman welder and journeyman plumber/HVAC. Ppl blow them selves up because they dont know what they are doing or use improper equipment. Refilling cylinders is perfectly fine doing it the correct way. All though refilling a store cylinder I would not do more than once or twice. They are not made to withstand repetitive pressure .you can buy 1lbs cylinders specifically made for refillable next to nothing. 5$/$10$. Air gas used to carry them. I deal with argon, helium, acetylene, LP GAS, OXYpropane, OXY ACETYLENE on a DAILY BASIS AS A PROFESSIONALM
DIY Hot Wire Foam Cutter