A tip for cd-rom motors: remove the original magnet ring and replace it
with neodymium magnets. It makes it easier for the controller to figure
out rotor-speed and -position (larger back EMF for sensing).
Members of the do-it-yourself outrunner mailing list are very content with
the services of Mr.George, he can even deliver to customer specification,
not all magnets are on his site:
formatting link
club:
formatting link
Met vriendelijke groet ;-) Ron van Sommeren
near Nijmegen, the Netherlands