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When you tighten the headset do the top cup and locknut lock together solidly?
Whenever I have had experienced threaded headsets coming loose its been because something* has had substandard threads and this can usually be felt when locking the top cup and locknut.
*Could be the thread on the top cup, the locknut or the fork.
M_V
I'm tightening the top lock nut by using two headset spanners....one to hold the the upper race and the other to hold the lock nut, when done all feels fine but an hour into a ride and both are loose again!