Quote Originally Posted by Donc1957 View Post
Yes, thank you. It is the bolt head retaining pin. It broke and I lost the ball bearing that I believe was in there also. Are all the E series the same? How can I tell which Series my 110E belongs to?
As Dave said, belongs to the 10/110 family. "E" prefix serial numbers were produced from 1982 thru 1989. There's a chart in the sticky topics at the top of this forum with serial number ranges - Dating Serial Numbers with a Letter Prefix.