I have what I guess you would call a louvered window over my couch.  There is a crank handle inside that opens and closes it.  There are two little "arms" on the outside that bring it in and out.  Now, when I try to close it, the window comes almost in, then the arms pop out and the window does not close securely.  I could not figure out how to make the arms stay in.  Has this happened to anyone and what did you do to fix it?