Hey guys, I am having problems getting my windsheild vent to seal. The backing plate for the flapper is uneven in two parts(first pic). You can see that the middle of the rib sticks out farther than the ends. This is causing the flap to bow and not seal against the windsheild frame. Any ideas on how to fix this, should I just beat the hell out of it with a BFH? The second pic is of the back side of the main rib. Thanks.