Where do I find gears????

Where can I find some brass gears? I need some of the corkscrew types and then some other types with large and small gears on one unit. Anyone know where I can find these or know what they are called?

[Comrade_Boris]

you are looking for worn gears.....please look through the TTTT posts for the suppliers.....

[Jimbob454]

I got a couple of small brass worm gears out of a N guage model train, and some gears out of a micro servo. You can buy the gears as replacement sets for cheap, or get the replacment metal gears.