I'm almost done with my follow focus, I have to put the indicator on the white and I will be done. I got a 90mm gear from a junk yard and cut the inside out so it could fit the dvx focus ring. I used a gear from my HP deskjet 810 printer I cannibalized for the turning gear. I built the rail system and pretty much got all the parts from the junk yard, cost around $50 in materials but took so long to build. But I am very happy with how it turned out, it works very well.
Here are some pics.
www.papalico.com/DSCN0013.JPG
www.papalico.com/DSCN0014.JPG
www.papalico.com/DSCN0015.JPG
www.papalico.com/DSCN0017.JPG
Here are some pics.
www.papalico.com/DSCN0013.JPG
www.papalico.com/DSCN0014.JPG
www.papalico.com/DSCN0015.JPG
www.papalico.com/DSCN0017.JPG