After swiping and cleaning the glass (See above), attach a small piece of Framespace to one corner of the glass to use as a gauge for spacing the first side. (See Below). Attach the first side against the gauge piece and cut the other end flush with the edge of the glass as shown. Continue around the other three sides of the glass in the same manner. If you use sharp anvil pruners or fillet shears, the Framespace won't crush and you'll get a nice clean cut.