in all my years of experience in baking, I have had no problem on using a fabricated oven, until one time, when I connected the plug from the gasul or liquified petroleum gas tank to the oven. Unexpectedly, when I strike a match to open flame for the oven gas burner, a ball of fire struck my hands and part of my face causing minor burns. So the control knob of the oven no longer functioning. I could not control the flow...