http://warmoth.com/common/frames/guitarneck.htm Click on 'truss rods' in the menu on the left.
This site has a lot of good info, small section on repairing truss rods at the bottom.
http://www.fretnotguitarrepair.com/trussrods.htm
You can buy new truss rods from here-
http://www.stewmac.com/shop/Truss_rods.html
Hope that helps :)
"If one has realized a truth, that truth is valueless so long as there is lacking the indomitable will to turn this realization into action!"
-A.H.
-A.H.