DC Motor for Physics

In class, students are using their design/build skills to create a simple motor. The default version is this design that I think is the clearest to build:

http://lees.mit.edu/lees/leeb-s.htm is the designer
and a full .pdf of instructions and the mini-lab is posted at

http://web.mit.edu/cmse/educational/motor_lp_kristy.pdf

Here is the design photo:

Here is a short video of a team of successful students basking in glory of being the first to get a working model during class: