Here's a conundrum. See what you all think.
The Super Record headset originally came with a chrome steel keyed washer that is 2mm thick. Later this was changed to a aluminum keyed washer with flanges and lettering around it that is 4mm thick.
As Tom mentioned, there is a Campagnolo tool that clips between the wrench flats on the adjustable cup and lock nut to keep the two headset wrenches from slipping when you adjust the SR headset with the early steel keyed washer. Tullio eliminated the need for the special tool by going to the lighter aluminum keyed washer with the flanges that also kept the two headset wrenches from slipping. Lighter and a more sophisticated solution, right?
Ahhhh, now the conundrum... is the 4mm keyed washer in aluminum lighter than the 2mm keyed washer in steel. Well the answer would be yes. But what about when you factor in that the steerer tube is 2mm longer when using the 4mm aluminum keyed washer rather than the 2mm steel keyed washer? Which is lighter now?
Anyone?
Chuck "things are never as they appear" Schmidt South Pasadena, CA USA http://www.velo-retro.com (reprints, t-shirts & timelines)