Tips for installing a vent in a portable AC unit in casement windows

Most of the advice online says to use plexiglass cut to size. Home Depot, Menards and ACE have plexiglass but won't cut it to size. I'm not a handy guy and hear plexiglass is difficult to cut because it splinters. I temporarily taped a piece of wood in the window but nothing is secure. As the AC unit runs, it pushes the vent collar and wood out about an inch. Any suggestions are welcome. Thank you.

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