bingo! addl star-washer is the move. 13mm is spot-on. doh!
walter
>
\r?\n> Hi Walter,
\r?\n>
\r?\n> 13mm is correct for the flats/slots on the frame-side of the pivot
\r?\n> bolts. 13mm Campy or (black) Park fit mine. On the front, use two
\r?\n> serrated (AKA "star") washers to space the caliper away from the
\r?\n> headset. You still may need to use a thin 13mm wrench.
\r?\n>
\r?\n> Lee
\r?\n> Palo Alto