In order to do the hot bending on the jig and not set the place on fire at the same time, I elevate the 1/2" round bar with square spacers. In addition, I add scrap steel sheet (1/8") in and around the area where the torch is being used. By keeping the torch parallel with the surface (horizontal), most of the heat is deflected away from the mdf. You can see some evidence of the torch, but it is very minor, more or less just a bit toasted.
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