Kwikee pull down bed

I bought a 1997 Alpenlite truck camper with a Kwikee pull down bed. 100 lb. bed that sits above the dining area, pulls down for use. It was apart when I got it, and I don't know how the return spring goes in. Made by Kwikee. Anyone have a pic or diagram of how it goes together? It's a really strong spring, sits in a black box on each end. Newbie, don't see how to post a pic. Thanks.