Hi Brian, run the command a second time and create another gear with the same "Module", but a larger number of teeth.

That will give you 2 gears something like this:



Now trim out a chunk of the big one. In this case I drew an ellipse and used boolean difference to cut the ellipse with the big gear:



Then move the pieces together:



Actually I guess you may want to give a slightly larger module on the big gear to make it fit together better? Anyway I think this should give you the idea.

By the way, this is for Petr's cool new gear command that he posted on his web page here: http://kyticka.webzdarma.cz/3d/moi/#SpurGear

- Michael