The part you are looking for: Threaded Stem or Mic Stud, most are chrome or nickel plated.http://forums.qrz.com/archive/index.php/t-293471.html?s=7131fbb7a9fe9726ec1b2710c89ddf3e
This is an "off-shelf" repair/accessory part for spring or boom arms used in
Pro audio and radio broadcast industry!!
CHECK OC White, one of better radio industry suppliers, IN STOCK ! ~ $17.50http://www.ocwhite.com/broadcast-arms.html
Luxo 13001 is common 41" spring mic boom used in radio studios.
You can also check MarkerTec, Dale Pro Audio, Parts Express or Full Compass