I'm at a loss with the headset on my 10+ year old mountain bike. I looked at previous posts but never really found an answer. The fork moves front and back but I know it's not the brakes. I can't tighten the star nut any farther. The bearings are original to the bike but I don't see any issues like warping or loose bearings. I didn't remove the headset but I didn't repress with no change. Im wondering if its the plastic ring that the spacers sit on and wedge onto the fork post.