M3 X axis move and clunk (Solved)

[fracturedtom]

I have my new board installed and the UGS tests almost worked. The X axis only moves 2mm either way and stops abruptly with a clunk sound. Won't move any further. By hand, I can push it 2-3" and than another clunk. I feels as if it's stopping in a hole or groove. I cannot see a problem, but suspect I have poorly adjusted the X. Before I start monkeying around with it, I was hoping that someone here knew exactly what it is.

UPDATE:

Loosened and re-tightened X axis wheels until the "clunk" was gone. Basically, I've learned not to tighten the wheels too much.

[activereality]

When you say 'tightened the wheels', do you mean adjusting the eccentric nuts? Or you tightened the through bolt for the wheels? I am building my CK right now, and will be trying to run it out and get some basica calibrations over the next couple weeks.

[fracturedtom]

I actually tweaked the nuts and the wheels. Also, as you tighten things up, check for smooth, easy movement. If it's hard to move by hand, it's probably too tight.