If this is a Craftsman product, call 1-888-331-4569 for warranty claims.
You might be able to enter your model number on www.SearsPartsDirect.com
or call 1-800-366-PART if parts are available. Usually, parts are not available for clippers.
If you are talking about a tree pruner, the answer to this question might help: shopyourway.com/questions/3306895
Hope this helps!