Originally Posted by
bulgie
Headsets should be tightened with two wrenches to jam the two nuts against each other. If you do that, the tongue in the slit doesn't serve any function. It's only there for rapid production-line assembly with a single air-powered tool, or for "mechanics" who don't have two wrenches or don't know the proper procedure.
At a Campy seminar in the remote past, the speaker asked for a volunteer from the audience (composed of bike shop mechanics and shop owners) to demonstrate his/her technique for the final adjustment of a hand-tightened headset. Some poor guy grabbed a single Campy headset wrench and proceeded to start snugging down the lock nut. The Campy guy said (somewhat gleefully), "You've just performed a hardness test!"
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