The flex couplers are these:
http://cgi.ebay.com/ws/eBayISAPI.dll...MEWN:IT&ih=011
I think they will work without contributing to error. As for the bearing. I played around with it more and it probably isnt the greatest. I think I can detect a little play, mostly by applying a moment to the bearing perpendicular to the rotation axis. Its not visually apparent, but I can feel it. It will have to be replaced later I'm sure...along with a lot of the other parts.
I really appreciate your time and help so far...I am learning with your feedback.
Colin