just a thought but is it possible something is stuck in the groove in that area and wont let it push in?Thanks Evan. It seems like the toughest part is the bottom/front corner where the seal is sort of like a "U" (almost). On my latest attempt I've tried starting with that corner & can't seem to get it shoved into the corner all the way. I've been using a butter knife & a plastic chop stick, but not luck getting it completely into that corner.
On my first try, I started with the vertical/back edge & was able to work it into the vent window frame (both sides) pretty well by being patient, but I pulled it out to try again. I'm now working on that bottom/front corner first since it seems to be the hardest spot.
Anyone else have some tips/tricks? THANKS EVERYONE!