Originally Posted by davegood
...there should be locking tabs on it to keep it closed at both lower corners of flap.
There are two locking tabs on the lower corners which keep the flap from falling out, but they cannot be tightened enough to keep the flap from vibrating. I still wonder why the flap is there - keep out bugs, cold, or some other reason. The design should be improved.
keep out bugs yes keep cold out yes .
as I stated before open the cover then apply thin foam with adhesive on the inside of the flap then shut and turn tabs . it should be tighter then
my cover is plastic and fits tight .