*Edit: changed the title to read 221NA for the burner after later clarification on this. Hey! First post here.Otherwise I am at CPL. Fairly new to stoves but renovated many lamps. Bought an Optimus 207 Burner NOS. But it does not burn well. Have tried everything it feels like but find nothing. 3 different nozzles. Have been looking for leaks with hot burner. (Kown problem) Tried other dishes. Now the seller has tried one of his 207 burners and it gives the same symptoms. Anyone have any ideas or have a burner that behaves the same?