Prototype 3D files at : http://www.thingiverse.com/thing:644938

Parts list:
DMC 1769-18 Darners Hand Needles, 6-Pack, Size 18
http://www.amazon.com/gp/product/B001AX100U

Sapphire Vee Jewel Bearings
http://www.amazon.com/gp/product/B0016JBB8E

I ordered some of these to test  because they are much cheaper.  I will update after testing.
http://www.amazon.com/gp/product/B0016JFF90

Used on Version 2:  Neodymium Magnets N45 1/2 inch x 1/8 inch Strong Rare Earth Discs
http://www.magnet4less.com/product_info.php?cPath=11&products_id=794

Used on  version 1: Craft Hobby Neodymium Rare Earth Super Magnets 1/2 x 1/16 in. (12x1.5mm) (10 Pieces)
http://www.amazon.com/gp/product/B0065O6220

Used on Version 1: Tiny Craft Hobby Neodymium Rare Earth Super Magnets 1/8 x 1/16 in. (3x1.5mm) (x50)
http://www.amazon.com/gp/product/B0065O63BK

Magnet Wire, Enameled Copper, Green, 42 AWG (gauge)
http://www.ebay.com/itm/251277238007
Also: http://adaptengineering.com/wire42.htm

Reed Switch was purchased at Electronics Goldmine years ago.  I am going to test these as an alternative soon:
http://www.amazon.com/gp/product/B008DTJORK

The MAGNASPHERE switch
http://www.magnasphere.com/
http://www.digikey.com/product-search/en/switches/magnetic-reed-switches/1114199?k=735-1000-ND