I haven't done business with them in awhile, but Wyatt's Musical
America made custom phonograph springs and might be able to help you.
They do not accept email and so I suggest calling or snail mail
contact.  They have a web page.

  Wyatt's Musical Americana
  Talking Machine Company
  P.O. Box 601
  Lakeport, CA 95453
  Ph. 1-707-263-5013
  Fax 1-707-263-8823
  http://www.wyattsmusical.com/ 

Good luck,

Chris Galantine
Redding, California