Received my new pieces today. No screwing required (no pun intended). The piece has a double groove, so it would seem that you slide it gently into the window's track. (There's a gap in the track that allows you to start the sliding process.)
But, when you get the piece all the way in, you can't (at least I can't) get the last remaining inch into the grooves.
I don't want to force the hell out of it and possibly ruin the piece.
Should I just try soaping the piece up and see if I can wiggle/squirm the last inch into place?