Found this Optimus on an auction. It appears to be the last version of the 350cp and has the 2-piece burner/frame assembly. The jet has a “3” stamped on the side. The air gap was set at 17.3mm. This is more than what I am used to with other lanterns being in the 13-14mm range. What is the correct gap? The vaporiser is branded “Petromax”, is this strange?
