"Simple" Bike Generator

My former co-teacher (and professor at Yestermorrow Design/Build School), Ben Cheney, called me up the other day looking for a voltmeter and an ammeter that could read up to 120 Volts and 10 Amps (respectively), and unfortunately, I didn't have anything besides a multi-meter to lend him, but turns out he needed these devices for a bike generator he's building for Efficiency Vermont to do demonstrations in schools. And the electrical design is similar to the "simple" one I was planning to put up anyway - so here it is:

It's merely a DC motor, but instead of supplying electricity to it, you turn the shaft, which then makes the process work backwards, generating electricity. The light bulb doesn't care which direction the current is flowing, so you can turn the shaft in whatever direction is convenient. According to the Simple Bike Generator I've got in my room (errr... rather which is out on loan to a Canadian college), the generator shaft is in direct contact with the wheel via a rubber stopper, which fits on the end for good contact. That's really have the job right there, though, is making good contact between the wheel of the bike and the generator shaft. It's not easy. But... you're creative, you'll be able to figure it out ;)