The only way to get a quality rebuild of ANY system is to do a complete rebuild. Often, the difference between a quality professional restoration and the rest is that the professionals will take the time, have the knowledge, are not afraid to tear the parts down to their most basic elements, and make sure that each part is reassembled just the way it was at the factory. Here, Dewey is installing the glass-setting tape that holds the glass into the filler bar. Do you have to replace the glass setting tape? No; but if done properly, it will ensure that the quality of the job will be consistent from beginning to end.