The needle on the Schrader valve is opened with the center post of the
hose end, not from high-pressure in the hose. The fill adapter depresses
the valve stem.


You have one of those fancy $30 adaptors that the turbine guys use.
Most common for GA lights planes is just the gooseneck by itself.
I started to explain about the tee-post adaptor but left it alone.
I think Aircraft tool supply carries them...
Kent