One of the many leaks that I found on the cleaned up L/H burner of the Optimus 182 was where the burner screws down onto the spirit cup. I could see that the sealing face on the burner wasn't quite even. However tight I screwed it down it wasn't quite sealing. Caused a few pops & bangs when gas escaped and ignited.
I applied a thin layer of solt solder with an iron to the spirit cup where it contacts the burner. It appears to make a sucessful seal when tightened - nice and soft. Hopefully it'll still disassemble - but I'm not taking it apart for as long as possible now.