I have a nice tail light lens to replace the one on the right side of my 1941 Buick. I removed the tail light easily enough but the lens did not come out with it. It appears that it is held in by a fragile frame of some sort. What is the accepted procedure to get at the lens without breaking stuff? All the original 73-year old materials are still in place. I have attached some photos. Any help appreciated. Thanks! Photos: Tail Light, outside ; Tail Light inside, light body removed ; Replacement lens