Abu Ambassador Exploded Parts Diagram Parts No. #5229. This is an oil sealing ring for the inside of the mechanical brake knob of Ambassador 1500C, 2500C to 6500C reels. It prevents oil leaks and secures the knob. When this O-ring deteriorates, oil leaks and the knob loosens during reel operation, causing the mechanical brake setting to become inaccurate. Replacing the O-ring allows for stress-free casting and reeling. It is recommended to have multiple spares for peace of mind. #5229, set of 5. Anonymous shipping, instant purchase OK. *The top image is a representative image; there are no discrepancies in the contents. The reel in the image is for reference of the part installation location and is not included in the sale.*