I'm been getting a lot of cold air in the cockpit this winter from the fresh air eyeball vents. They don't close very well so I put band clamp rubber plugs from Home Depot on the eyeballs, but there's still quite a bit of leakage around the seat of the eyeball. Anyone come up with a solution for this (other than stopping up the intakes on the outside of the fuselage which I'm assuming is a no no).