This is the flapper door assembly. Sorry I didn't take any photos but I was so busy fixing it, I forgot. The frame was a fiberglass jigsaw puzzle busted into four different pieces but I was able to reassemble and repair it with epoxy and fiberglass bondo.
This assembly was originally glued into the shaker domes with some type of red resin epoxy that gets rather brittle with age, which is actually a benefit since it is easy to chip away in order to free either the flapper door assembly or the block off plate assembly. Here it is set into its original position in the busted shaker.
