Ballscrews reloaded - part 2 :)

Hi Folks,

Well, I managed to reload my one ballnut with relative ease. It moves a
lot nicer now that all the gunks been cleaned out.
The problem I have is the little ballnut at the other end. It's the one
without the reflow tubes.

I'll put up the pics and steps I went through to reload the larger
ballnut on my site soon, but for now I'm stumped with this little one.
It has 3 plastic inserts (the ends of them seem to have been melted).
These inserts seem to prevent the balls moving around inside.
Am I correct in assuming that these inserts were put in with a special
tool that squirted plastic in there?
They have the mysterious number 2005 stamped into them, I assume that's
their best-before date. :)

Can I make new ones using my hot-glue gun? Or is there another way to
reload it? How do I go about this?
Heres the link to pics of the mini-ballnut:

http://www.silverkatt.co.uk/images/mystery1.jpg
http://www.silverkatt.co.uk/images/mystery2.jpg

Sorry for the poor quality images, my digital camera is from the
cambrian period, I regularly end up with trilobite-shaped shadows on images.
The little white bits which look like popcorn are the plastic inserts,
they actually have the "thread" of the ballnut roughly melted into them
where they wrapped around inside.

Any advice? Or is it time to start building a space-helicopter?

Regards,
Abby