If the film is only a tiny touch not recognized properly, then the minimum skew adds to it ultimately at the "other end" on the edge of the Nexus rests and stands out with the appropriate, stupid and elongated bubbles.
We have two men, the film ultimately be able to apply exactly the perceived 10th trial (has lasted one hour) now they fit perfectly and can not be seen.
Würdemann make this film about 1mm rundherrum smaller so minimal displacements would possibly not soooo carry weight, but that's almost impossible to apply the foil clean and correct. smallest error revenge ...