I have some 2 x 2 thin glass inserts for slides and might have a use for these other than for their intended purpose.

Occasionally, in a deal, I get a viewfinder or rangefinder camera with a broken outer viewfinder window. I need to remove the top and replace the broken glass with new glass. If I could cut a piece of the thin glass 2x2 and use that to replace the broken glass that would be ideal. Is there a way to cleanly cut the 2 x 2 insert? I have heavy duty razor blades. Or, other creative options? Thank you. - David Lyga