The Grace 704/714 tonearms did not come with anti-skate, so no parts are missing. They are low-mass arms (6g from what I've researched), and stock pictures of them had F9s mounted, so I really think they are meant for high-compliance cartridges. @viridian Where did you see that they were designed for low-compliance?
@cleeds I saw as well how older VPI arms did not have anti-skate, and were also uni-pivots. But Lederman notes in his anti-skate article (on SoundSmith's website) that VPI eventually added AS adjustment, probably at the behest of users.