Swedish Camping Stove -- Trying to adapt the fitting so that a small propane tank can be used...

This fitting is 14 mm...

Turns out that the fitting is not only metric, but also left-hand threaded (backwards to typical/normal)...

I bought a 14 mm adaptor (to 3/8") but because of the left-hand thread, I can't use it...

Removed the left-hand threaded adaptor.

This threaded section measures 0.375 inch, which doesn't translate to a metric mm equivalent so it appears to be SAE?

Strange.  I'll have to get a 3/8" fine thread nut and see if it fits...