So, I'm trying to align and calibrate both a 90mm and 210mm lens onto a DaYi Shift IIA 6x17 camera.

Here's the camera:
http://bhcamera.us/dayi617.php

I can get the lens mounted (that part is easy - just like on 4x5), and can see an image in the ground glass, but can't seem to get it in focus at infinity. Anyone have one of these and know the trick?