[travis]

The first book anyone interested in making moving metal doodads should acquire is Machinery's Handbook -- you are chumpatizing yourself without it. Probably half of the [actual] questions asked on this forum are answered within. Wait for a coupon from your local big box book store (they're >$50), or get an old one off ebay; they haven't change any useful mechanical standard for 50 years, so used is fine.