I'm still working on my Petromax 836. There is a steel big jet on this lamp. It's not working fine, I think the hole is worn out. I'll try to make one myself. Can anyone tell me what type of thread is on the Petromax 836 jet? On the picture the steel 836 jet on the right and a normal brass 350cp jet on the left.
I can't help with the thread but it might be easier to resize the jet with a hypodermic needle. Petromax 900 “ Little Baby” Hypodermic Needle fix for the Jet