Ultimate parametric 1204 1605 2005 ballscrew nut reballing tool, nut removal sleeve
https://www.youtube.com/watch?v=OXjipPxo1X8
This thing helps you assemble a ballscrew nut in 5 minutes. Just screw this in, point the groove in the cap to the recirculator upper end and pour in all 16/17 balls, they'll spread alongside the groove, then repeat this process for other recirculators.