Reinstall ball bearings in linear guide

I have stupidly moved the carriage past the end of the rail and a
few ball bearings fell out. I need to put them back, I am sure.

I have tried in vain to locate any information on the net about how
to do this and thought I should have some information before I
blindly try this...

Please help! Has anyone done this, or know a good reference.

Thanks!
Carl

PS. I am refering specifically to a Thomson AT-25A, if that matters.