I have a new Edison Concert mandrel that was made to fit over the main arbor of any Edison Concert or Triumph. You knock the small mandrel off and put this one on, and voila, a properly fitted Concert machine. If interested, please contact me directly at _phonophan at aol.com_ (mailto:phonophan at aol.com) Best to all, Tim Fabrizio Phonophan PO Box 747 Henrietta, NY 14467 585 582 1586 FAX 585 582 2624 Visit the phonophan Web site: www.phonophan.com