I’ve been looking around for some parts that were missing on a Campagnolo Contax headset I have; the o-ring seal that nests on the crown race. After a short discussion on the NYC Boards, Jeremy, who runs Tears4Gears and cracked the Merckx serial number index posted the above image to clarify which part I needed.

I did a ton of exploded assemblage diagrams in Architecture school and something about them makes me wish I was still hand drafting again. Click the image for the full resolution.