Originally Posted by
edogawa
That's the correct behavior. 8 speed DA had shorter pull than other 8 speed, so when you use it with a non 8 speed DA derailleur, it pulls 9 speed amounts of cable. There are only 8 indents, so you lose the top or bottom gear.
If anyone cares, it worked without a glitch. The 8 speed Dura Ace seemed to pull the 9 speed flawlessly with one gear locked out.