I have a Petromax 829B 500HK Bundeswehr made in 1962.
Today I had the lamp apart because the lead washer (part 90) between the vapouriser and the tank was leaking. I thought that it would make sense to replace part 193, Vapouriser washer whilst I had the lamp apart.
The new part 193 is not exactly the same as the old one. The old part is hexagonal and the spring fits inside it. The new part is round and the spring fits onto it.
I fitted the new part but found that the valve leaks very badly and will not close. The problem is that the new part 193 has a hollowed out, conical brass section in the centre but this is slightly raised up above the rubber washer. The old part has the same brass centre but it is level with the surface of the washer. This tiny difference is enough so that the valve will not close.
It is not possible to adjust the length of the lower part of the conducting rod so I do not know what to do.
Does anyone have any suggestions? I could replace the entire vapouriser assembly (part 115-500) but this seems ridiculous for the sake of a washer and anyway I would like to keep the lamp as original as possible.
The picture shows the new part. The old part is back in the lamp because it still works (for now)