Glass Bed- Jig for cutting corners

I created this little jig so that I can consistently cut the corners off of the glass that I'm using for my printing surfaces. I'm using cheap picture frame glass that I recover from broken picture frames I find discarded (usually 2-3mm thick). I've never attempted to cut borosilicate, so your mileage may vary.

Use of this jig requires a glass cutter. I also recommend using some cutting oil (kerosene, 3-in-1, Mineral Spirts, and others work too), and a pair of pliers for breaking the corners