Originally Posted by operator

You have no idea what you're talking about.

The only thing that keyed washer does is end up stripping because it encourages people not to use the proper headset wrench and proper top nut wrench to tighten their headset. A keyed washer serves NO good purpose WHATSOEVER on a headset that has wrench flats on both the cup and the top nut. Its original purpose is to allow tightening of the topnut without using a headset wrench below it. Which it fails, and fails very good at doing.

I understand exactly what the purpose of a keyed washer on a threaded headset is and why it shouldn't be used.

*You* obviously understand the first part, but not the second. Educate yourself.