hi all Last August I did receive my first Optimus 111 with the idea that I was going to make a new one with it. So before to open it I did a try to know more about my new stove that has been store for 50 years. Not to bad after all Then I did order 2 full kits to fettle my news baby. Meanwhile I did open up the stove and wash everything including inside the burner raise with 30 min citric acid, a bath. So far so good 3 days ago, I could not hold my self to try my stove even if it was -22 c outside. I wanted to know if it was true they could work well at low temperatures. So I did bring my stove outside and 2 hrs later !!!???!!!! A good prime Here we go Super, as you can see everything go well but I don't like the hot spot. NOW, This morning I have decided to fire up the stove inside to boil some water and make some final adjustments and then I have discovered a build up of black soot on its pans support plus some on the base case and nothing under the pot I was using to boils water. Moreover the soot is dry and the flame seem to be ok and the jet is not plugged. One more thing, I did not see any black smoke. ???!!?? And now the burner is all black of soot too. See yourself Question- .Is it possible that that soot or carbon come front the inside the burner (now) warm by small pieces after 2 clean up and rince and now I should do a heat & whench? If yes, how do you do a heat & wrench on a regulator burner as the 111? I could not find any indication today except an ink that say it is a bit different. Any Idea? Thank in advance for your help.