Rotating ball nut, Ballscrew Pitch, RPM limits, and my particular build pickle

[routerdriver]

From the little I know about ballscrews it would take a lot to persuade me to dismantle them.I think I would first pump quite a bit of grease through them to flush out anything that shouldn't be there and I might do it more than once and in slightly different positions.If it didn't improve things I think I would watch several youtube videos before even contemplating dismantling and I would take careful note of any warnings.I would only do the job on a large and clear bench with some kind of rail surrounding it for restraining escaped components.The sequence of balls may be important as I have read accounts of sizes being intentionally varied along the assembly and the variations are tiny,but necessary so that you don't get a situation akin to a line of balls trying to move but effectively having their neighbours walking on their heels and impeding free motion.

It would be much easier to clean the threads themselves very thoroughly prior to any form of dismantling and this might pick up any particles that have been attracted to the protective grease that would have been applied for initial assembly and transportation.If you are lucky it might be enough to help but as you have discovered a 5mm pitch is a bit fine for the intended use.