top film, unfortunately minimal too large and therefore very difficult to assemble

It's a really great film, the properties are so far super.
Unfortunately, the top film is minimal too large or so fit that you can thus assemble them very difficult. Eventually I ran out of nerve and have the top of the screen now at the edge of a page an unsightly corner. That's why the one star deduction.
The top sheet would be really right and left only a millimeter smaller, and they would be to mount also super. Real incomprehensible, because the upper film is actually having on the sides anyway no function, since yes is no longer display.