All the rotohinges I could find we're to big for little boxes.
When I made my salt box (look in other things we make) and reefboy made his (look in the Northern California forum) we used 1/16" stainless rod glued into the bottom and a 1/8" brass rod drilled 1/16" for the pivot in the lid. Works flawlessly.
My box:
http://www.penturners.org/forum/f45/eucalyptus-salt-bowl-105947/
Both rods were bought at our local True-Value hardware store. They also had 1/8" brass tube that already had a hole just a teeny bit too loose for the 1/16" rod. But if you can't drill brass rod it would do.
Gk