...a keychain-type...I was referring to the factory supplied pins with a separate circular wire slip on retainer. You separate the overlapping ends of this separate wire and insert one end in to the hole drilled at the end of the actual pin, fun with gloves on. Whew...Then you rotate the circular wire until it passes the over-lap. Re: Lynch-pins...I love them if my wife doesn't "borrow" them for her horse carts etc.