Hi all. I'm almost ready to start my next project, which will be a barn door mount controlled by Arduino. If you are not familiar with a barn door mount, it is basically a tracker to counteract the earth's rotation for astrophotography - http://en.wikipedia.org/wiki/Barn_door_tracker
I am still in the thinking stages, and I'm not sure if direct shaft drive or some kind of gearing would be better. I have a basic stepper motor to use https://www.sparkfun.com/products/9238, but I'm wondering where I can get gears and things like that to fit the shaft? I may also use a drive belt but I'm not sure where I could buy parts like that?
I'm in the UK so I would rather buy locally than wait for oversea's postage etc.