How in the hell did you get a 22mm socket back there... i had a tough time with that bottom one. Used an EXTENDED length flat head screwdriverNA1 #2853 said:Just a hint.....
Instead of using a screwdriver like mentioned above to get those 2 "funky" nuts that hold the whole vent assembly in.
I used a 7/8" or 22mm 12pt box wrench, slipped it over, got them lose. Then spun them off by hand.
Took a minute or two, while my friend was yelling obsenities for 10 mins trying to get them lose.
-Ray