If you are low on cash and need a follow-focus, maybe one built out of LEGO will do:
HDV Blog: DIY LEGO Follow Focus for EOS 5D Mark II PART 1 (http://ryo1972.web.infoseek.co.jp/HDV/archives/2009/02/diy_lego_follow.html)

-- peer

That had to of been the best laugh I have had in a while. At least it will be inexpensive when it breaks.

That's a Zacuto part, right?