Roof Air Vent Handle
Roof Air Vent Handle

The thick vertical parts of the handle have 6mm pillars which protrude into the air vent canopy. They are then welded into a hat shape to secure the vent to the handle pillars! When the handle is pulled down to secure the canopy, these hats take all the strain produced by the handle springs. The plastic is not capable of this pressure as it gets older!