Turns out RM manged to deliver the new ball nut today, tried it a second ago, it's worse than the previous one. Seriously WTF? the new one refuses to screw onto the ballscrew to start with, I've used some grease to make sure it goes on smoothly, but it crunches, blocks, jams and fails to rotate with ease. This is along the whole ballscrew which is 150mm, I've tried screwing it on with the mounting base pointing upwards and downwards, doesn't make a difference. I'm lost as to what it is, especially since this new ballnut has less balls than the one I'm using, I've got 85 int he old one and 81 in this one (27 per circuit).

Argh...

Regards,
dsc.