Fischbein 10077 is the thexible seal that holds the oil inside the machine and dirt out. This part is moving around the base of the Feed Dog (10078 or 10079) while it moves. This part is can wear and tear rather fast and needs to be replaced. 
Fischbein Spare Parts
10077 Feed Dog Seal for Fischbein Empress 100, 101, 200, 201
