the bb with chamfered spacers.
Jesse found that the bottom bracket shell
(the fat red tube at the bottom of the frame through with the cranks are joined)
was too narrow
for the italian threaded dura ace bottom bracket set
(the spindle that joins them, the bearings it turns on and the cups that stop the bearings falling out each end)
so two spacers were machined, each 2.33mm width
and chamfered (shaved at an angle on one side) to meet the bb shell more neatly.