Cricut Expressions 2 Display Hole Cover

I got a great deal on an old Cricut Expressions 2 vinyl cutter with only one problem - it was broken in such a way that you couldn't cut out your own designs, only the canned designs Cricut sells. So I ripped out it's brains and display. The display hole is covered with this object.

I originally designed it with clips on 4 sides but couldn't get it inserted without breaking them along one edge. So the design has them on 3 sides now but if you try to remove the cover once inserted you'll p