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Had a similar issue with a frame. Tried 2 different forks, 3 different headsets, and all the combinations of both components, never got rid of the tigh point on one side. head tube doesn't seem to be damaged or anything but I'm no expert.
Riding it as it is, not causing any significant problem, can ride it also no-handed (but feels not 100% stable to be fair), but never understood the cause and drove me crazy
Got my hands on one of these Raleigh Randonneurs from the late 1990s with Reynolds 708 frames. It's in pretty good shape, although somethings up with the headset - its stiff when I turn the handlebars to one side. Have disassembled, cleaned, and regreased, and there's no sign of pitting...so not too sure what's going on.
Am thinking of going neo-retro with some Tiagra 4700 brifters and RD, tektro 720 cantis but will keep the Sugino cranks.
Thoughts, comments, suggestions, welcome