Sometimes shellac will turn brown with age. This is caused by dirt getting into the surface of the finish (and a lot of why the rag turns brown in the initial steps). You can get black aniline dye from a woodworking supply house and mix it with the shellac to turn it black before applying it. Make sure you order alcohol-soluble dye--some of them are made to mix with water, and water is bad for shellac.
The rusted metal parts were put in a soak of Evap - o - rust over night. Then they were cleaned up with a wire brush. A Dremmel tool is handy. Be careful to keep your hair and loose clothing out of the way.
At any rate Here is an almost finished machine:
[ATTACH=CONFIG]449218[/ATTACH]