I have many small glass founts and bought Gaudards 8''' brass mounting rings (Vasenringe) for them. Now I have tried four old Kosmos burners, but none of them can be screwed in completely. Only one turn, and then they get stuck.
Do you know if Gaudards rings have another type of thread than the old?
I don't want to buy new Gaudard burners for them. Maybe someone here can advice me where I can find old 8''' mounting rings?
I think one of my burners is from Hugo Schneider, and two others are of the type that Deutsche Bundesbahn used (with locking screw).
Sorry for writing in english. I can read some german, but not write it.