I create one of a kind art glass windows and oil painting. I create the feeling or essence of something such as an emotion, music, instrument, human figure in a specific pose. Please view my work at http://isaacdsmith.com
After removing the outer bar, the old putty/cement needs to be cleaned off the glass pieces. In order to get the glass that is cracked out I had to remove the adjoining good piece of glass. The lower picture shows the putty/cement being cleaned out of the lead channels.
Re-cut the shape needed to replace the broken piece.
Put in the new piece and reinsert the other glass that was removed.