Example of an e-clip
http://www.google.com/search?um=1&hl...qi=g3&aql=&oq=

examples of snap rings
http://www.google.com/search?hl=en&r...og&sa=N&tab=wi

and some snap ring pliers
http://www.google.com/search?um=1&hl...qi=g3&aql=&oq=


(bored at work... using Google to pass the time!)