There is plenty on line about the plain tack twist repair. This is NOT about that version.
Does anyone have any experience or pointers with the Ingersoll pens with the threaded tack that has arrows and the "empty" and "fill" on the tack? The inside of the twist unit appears to have a slot for a screwdriver. The threaded part of mine was pretty rusty looking, so I am not sure if the parts are stuck, or if my assumptions are wrong.
My pen is open, sac is out. I am putting a long screwdriver down the barrel into the slot (looks just like it is the head of a screw....) and trying to twist off the end knob.
I would appreciate any input from someone who has restored this model before.