Appears our dear sponsor Fettle Box is out of stock regarding replacement pump leathers. My recently acquired 829 will need one eventually, along with some other things that I would like to find (such as a wrench, and perhaps a spare needle and jet, etc.). Anyway, asking for advice on where to find parts for this oddball lantern (oddball to me being deep in Coleman country, and my usual suppliers not carrying any stock for the exotic beast). And yes, as you can tell from my first sentence, I did try the fettle box first.
Benzinkocher und Petroleumkocher or STUGA-CABAÑA 2020: Der faire Internetshop mit über 20 Jahren Tradition. HYTTA.DE Petroleumlampen - Petroleum - Eisenwaren - Haushaltswaren Both excellent.
Both groups recommended by myself offer NOS German made parts for the Petromax, doubt you will find that in the US.