For the next page of the forth coming Gear Zine I need a small drive gear to run against a larger gear. I've decided on a seven tooth gear. The teeth on smaller gears need a more pronounced curved surface than do the teeth on larger gears so I've opted for a gear made from double thickness card where the teeth profiles can be individually cut.

I've gone for the same round pin in a square tube layout as the other gears. The addition of the two green pieces hold the gear square against the axle.

And here's the result. Looking good so far!