I have an old knee mill, made from castings.
It is table top, so about half or 2/3 the size of the commonly known Sieg X2.

It will be used for manual milling only, no CNC.
It is fairly accurate but the 5/8" acme screws and nuts should be replaced. (Could use a good scraping too.)

My question is are ballscrews an option?
I know double nut ballscrews are great for reducing backlash.
Also backdriving the screws from cutting forces may be an issue.
I have 1/8" pitch Amce now so I'd be looking for something in that range.

I'm wondering if there are any great benefits to manual milling with ballscrews or should I KISS ( and stay with Acme)?