Small metal parts can be cast at home without the use of sophisticated
tools, using high-temperature silicone rubber or RTV (room temperature
vulcanizing) molds.  It is quite easy to cast metal parts using low-
temperature alloys such as pewter and other low-melting-point (between
600-700 deg.) casting alloys.

Here is a good link for materials and how to use them:

    http://www.miniaturemolds.com/makeyour.htm

Here is an excellent book by William Cannon with detailed information
on how to make the molds and cast small metal parts:

    http://books.google.com/books?id=61ePFWR1qFMC&dq=cannon+how+to+metal

For safety's sake, it is important to avoid low-temperature alloys con-
taining lead.

Michael Swanson