The best modern compromise on fitting the glass into the frame,IMHO is to use small swatches of the gasket material around the perimeter of the glass.once the frame is all together (and you did'nt break the glass)Take a tube of fast setting ureathane windshield adhesive and pump the frame full.It will a terrible looking mess initially, but dont worry,when dry, it will clean up with a razor blade in a couple of minutes and never leak a drop.I also comes in handy if you are stuck with one of the ill fitting tr3 screens on the market that is cut wrong in the corners.
MD(mad dog)