Yeh, I wonder if precise enough, Could score both sides of a windshield with a glass cutter. And tap across. I just don't know if the lamination plastic would allow it to crack. I'm guessing that's what others are referring to heating the line to separate, by melting the plastic. Too much heat and it would wreck the plastic back into the good piece. If it would strech even a little, could cut with a thin blade or wire.Shoulda tried on my old one(long gone),