Train Magnets

You could try to magnetize appropriate sized ball bearings?

-- Growing older but not up!

You could use these
http://www.supermagnetman.net/index.php?cPath=43

-- I am always doing that which I can not do, in order that I may learn how to do it. - Pablo Picasso

Or these http://powermagnetstore.com/acatalog/Cylinder_Magnets.html

-- I am always doing that which I can not do, in order that I may learn how to do it. - Pablo Picasso

Thanks for your help. I must be having a bad internet day, I looked for a website for a long time and you responded with two sites in a half-hour.

Lee Valley sells some half-sphere ones too which might be easier to mount and slide on each other

http://www.leevalley.com/wood/page.aspx?c=2&p=45088&cat=1,42363,42348&ap=2

-- Ed

More magnets in any shape than you’d want to shake a stick to:

Rare Earth K&J Magnetics
SuperMagnetMan Magnets
MAGCRAFT® Neodymium Magnets
Gaussboys Super Magnets

Don’t thank me, thank the slight OCD side on me that helps me keep a perfectly tidy Bookmarks folder in Safari. :o)

-- Jojo, shopless in Kyoto · http://www.japanese-woodworking-tools.com/ · http://twitter.com/japanesetools

Look for rare earth magnets in the size that you need

-- There is no such thing as a mistake. Its called a design modification Rick Kruse, Grand Rapids, MI