[TJ]

JM, some of the glass guys I used to know would pour lighter fluid around the edge of the frame to soften the setting tape. Take out the four screws and use kroil or trans fluid ( I have also used Lock-Ease for this) to break the rust that holds the square bars in the frame. I would soak it for a day or two. You can also use a propane torch to apply a small amount of heat to the frame in the area of the screws. Get a block of wood and put it against the frame lip and tap it with a hammer. Rotate the block from side to side and repeat on the top edge of the frame. It will take a while , but it will eventually come apart without breaking the glass. I did this last year with a 37 frame and saved the glass for re-use.