[jdmccright]

You could try some Duro plastic welder epoxy to fill the hole. It sets fairly fast (15 minutes) and stinks like hell, but it does a good job of rebuilding plastic pieces. After it cures, you can machine it, sand it, paint it, etc.

You could also purchase a plastic welder, which is basically a cross between a hot glue gun and a soldering iron. The tip is heated and pressed against the part to be repaired, and a hole through the tip allows you to insert the welding stick of plastic to melt and flow into the repair. As long as the weld site is not at a stress concentration (i.e. a support bracket tab), the weld should hold. Various weld sticks are available to match the material being repaired.