Originally Posted by
Unca_Sam
Yes, I use two wrenches, a park tool for the cup and then an an Antique Coes wrench for the locknut. This headset has just been difficult to adjust well. I'm fairly sure it is a Tange model, with my parts bin locknut added on after the threads stripped out of the original. Even adjusting preload to ⅛ turn from binding, it was difficult to tighten the locknut down and turn the adjusting cup back to find the sweet spot between binding and knocking.
Properly adjusting a threaded headset is a some level an acquired skill but if the cups and the crown race are not parallel, it is impossible to get adequate adjustment and keep it. The uneven wear on the bearing tracks could indicate the frame/fork would benefit greatly from facing.