Denford Triac Z axis ball screw removal

Hi

I've posted this up on the Denford site but thought I'd put it here too :)

I've recently bought a project Triac. I knew the Z ball screw would probably need replacing but after some advice from Colin on here I have searched and found somewhere that may be able to re-ball it.

Clearly I have to take it out and that's where the challenge comes...

I've done some googling and I haven't found any info or procedure on doing this.

There doesn't look to be enough room for the screw to be removed without removing the lower bearing.

How I see it:

1 - remove pulley.

2 - remove locknut and tab from top of screw.

3 - not sure...

I don't want to hammer the lower bearing out with the screw as it may damage it.
I can't get to the rear to remove it with my blind bearing puller as there is no access.
I could maybe drive the bearing out with a long punch being careful?
I could unbolt the column of the base and get to it that way but I'd rather not disturb everything - saying that if I got the lower bearing out I would have to fit a new bearing from the bottom anyway.

It's a bit like one of those puzzles you get at Christmas.

Any thoughts would be appreciated - particularly if I am missing something obvious.

Thinking about taking the head ball nut bracket of too to go with the screw for the refurb so the pre-load is correct.

My Triac doesn't have the bearing cap as per the drawing below.

Attachment 23841

Attachment 23842

Attachment 23843

Attachment 23844

Attachment 23845