Z Axis questions

I bought a pre-assembled printer that arrived yesterday, I hope I'm explaining this correctly.

The nuts on my Z Axis rods move outside of the brackets when I move the Z axis back to home. They have even fallen off of the rod at the end of the move.

Would it be a bad idea to glue the nuts into place in the bracket? It appears to me that I wouldn't want those nuts to move without the bracket.

What printer is it - upload a pic if you're not sure. If the Z axis binds then this could happen but I cannot see how the nuts could completely unscrew.

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Waitaki 3D Printer

[i1280.photobucket.com]

I couldn't make a picture small enough to post here, so I created a photobucket account for it. It looks like a Prusa Mendel, but it's called an ecksbot on the packing slip.

There is supposed to be a spring under the top nut.

Assembling: top nut, spring, x-end, nut.

When you push the x-end up against the spring you are putting tension against it. Tighten the bottom nut against the bottom of the x-end. Allow the x-end to slide over the bottom nut. The spring tension inside the top will keep the x-end in relative position and the nuts will stay inside their housings.