So I did the deed this weekend, put in a Tange LEVIN CDS, 27.0mm.
Question: the top locknut of the CDS headset has a rubber o-ring gasket just below the top. Should it be partially engaging the steer tube threads, fully engaging them, or just barely touching them? I had to use 3 (2mm) spacers to get the gasket barely/partially engaged, I would like to remove one or two of the spacers, assuming the locknut isn't bottoming out but the o-ring is fully engaged.