Update: Home depot has no idea what I meant by Belleville or wavy washer. I tried describing it and it was like explaining how a television works to a cat. They just tilt their head and give you a funny look:
Ace hardware had them but ONLY in metric sizes.
Home depot disd give me intternal lock washers. There NOt split but may work. A picture of them is at the link attached: http://images.search.yahoo.com/image...mb=PCPe52cu1bc