This part is an OEM from Abu Garcia. The worm gear cover (6500C) is compatible with many Ambassadeur fishing reels. The metal item helps to fasten the worm gear onto the line guide, assisting with reeling the line onto the spool. A screwdriver and needle nose pliers are often needed for making the replacement. The worm gear cover (6500C) is sold individually.
This is a manufacturer authorized replacement part used on Abu Garcia reels. Retaining/Lock Rings are designed such that their contact diameter has some interference fit with the groove in which they fit. This creates a fit between the ring and groove. This part is made out of metal and is sold individually. To complete this repair you would need a screwdriver and pliers.