Thomas Adams wrote:
> Is there any trick/problem installing a Dura Ace Ex headset, the one
> with the scalloped nuts?
>
> Headset is going onto a repainted Bob Jackson. Frame had a headset
> in it before painting so headtube/steerer was working fine, and
> there's no sign of damage.
>
> But new headset (which just barely has enough threads to engage the
> top nut) won't adjust. Either too loose or binding with no perfect
> adjustment in between. The bottom cup seems to overlap more than a
> typical headset. Did I put it in wrong? Any suggestions? I checked
> the facing of the head tube and all seemed allright. Whattya think,
> list?
What was the original headset? The Dura-Ace EX used 3/16" balls in Campy-compatible retainers, but the cups had a sort of labyrinth seal built in which made it taller stack-wise than many other contemporary headsets.
Make sure that you're using the proper size balls, and that the retainers (if any) are properly oriented. You may need to substitute a unit with shorter stack height.
--
-John Thompson (john@os2.dhs.org)
Appleton WI USA