New Moto Guzzi Door Mats Available Now
There's a nut on that screw. You can remove the whole seal/vent/baffle assembly from the cap outer by pushing in on it and twisting it 90 degrees. Then you'll have access to the nut and flat spring as well.
Thanks for the info. You mean push on the seal/vent/baffle assy. Can I do this with the cap on the tank?