First step: Carefully score by cross-hatching the entire cracked piece, as shown.
Next, carefully tap on the glass to break it into smaller pieces. Be sure to wear safety glasses ... bits fly everywhere. Then gently remove each piece using needle-nose pliers.
Once the broken glass is removed, make a template of the opening and cut a new piece of identical glass, in this case, clear rough rolled. Then, using a soldering iron, loosen the copper foil that was around the broken piece. Using the pliers, remove the old foil from it, as well as from the adjacent pieces. Then use “GooGone” to remove all the old adhesive from the foil. Clean thoroughly. Re-foil the adjacent pieces as well as the new piece.
This repair was tricky because it was in the corner. I had to cut the glass slightly smaller to fit the space, then push it away from the adjacent glass and toward the corner, so it would catch inside the channel (metal frame). This resulted in a slightly wider lead line than I prefer to have, but it was the only option. After soldering and patina-ing the repaired piece, I affixed two hooks to the back by lightly sanding the upper back corners and soldering them on.
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