I got started on the Ballscrew Next

To shorten, The first thing to do is to take the Ball-Nut off the Screw, without messing it up

You need to make a mandrel/sleeve to the root diameter of the Screw & long enough for the Nut, With an ID to fit on the end of the Screw, Then you can just rotate the Nut untill it’s on your mandrel/sleeve, When that is done & the Nut is secure on the mandrel/sleeve, you are ready to cut the screw to length

Cutting the Screw can be done alot of different ways,with a lot of different machines, even with a Dremel, the most important thing with cutting a Screw is not to get it HOT as this will change the hardness in that area of the Screw, So for this Screw,because it is short, I will do it on my surface grinder with a standard cutoff wheel, this is quick & easy to set up, & it does not get Hot doing it on this machine