Jim Owen of Yamaha Customer Service (1-800-962-7926) called today and informed me that the "Woodruff Key Problem is solved". They will not help in upgrading any 03 WR450 to 04 parts, and the owner is not allowed to do it either. "Modifying the WR450 from Stock is strictly forbidden." He said, "The Woodruff Key problem is solved. Since we posted the Tech Bulletin the letters stopped coming in." and "We have no plans to do anything furthur. We haven't seen any failures of any WR450 after it was serviced to the TECH BULLETIN specs" Well either you guys on this site are all telling a story, or Yamaha is lying to us. He also said that they count only letters. They don't count phone calls. So if you haven't written Yamaha, you can blame yourselves for their lack of response.