Automatic wiper access

Does anyone know the civilized way to gain access to the Trico wiper mechanism?
The manual arm lever is knurled as if it may be unscrewed possibly allowing the escutcheon to be removed allowing for the removal of the panel.
I have tried to remove the windshield piano hinge that is blocking access to the Trico mounting screws and it seems as though they have a nut on top that is spinning freely.
I have tried to remove the windshield piano hinge that is blocking access to the Trico mounting screws and it seems as though they have a nut on top that is spinning freely.
Being an original survivor I don’t want to botch anything!



Comments
I was able to unscrew the tiny lever without bodgering the knurling with an 1894 Dudly bicycle spoke wrench. It worked like a charm! The windshield mounting nuts are now accessible and soaking up some penetrating oil, judiciously applied with an eye dropper.