I have an old threaded headset and quill stem. Recently I overhauled the headset; replacing the bearing sleeves with loose bearings (filled to max and removed 1 bearing). The stem was also found to be too large to fit back in, and was replaced with a proper fitting one by a bicycle shop that specializes in older used bikes.
Now when I am riding I get this strange gyroscopic effect while riding (see this post for similar issue)
When riding in a straight line I can feel a push and pull to one side or the other, as if a ghost is steering my handlebars in millimeter amount, but enough to notice. It almost feels as if my headset is drunk, wobbling around in circles. A similar feeling would be turning your neck in circles as if stretching your neck... just not as intensely.
I've tried loosening the headset to the point where when I pick up the bike the handlebar smoothly drifts over to one side from the weight of the wheel being picked up.
Does it matter if the quill stem is tightened or loosened after the threaded headset is adjusted? I don't think it does.
I'm lost here! Please help!