Re: G0704 - Y ballnut won't fit in the base, the lubricating valve sticks out too muc
All that could be done with a hand grinder.
The nut is real hard but can be cut with carbide but a grinder or sander works well. Don't get the nut too hot and you will be fine.
Remove all the paint where the ball nut runs on the under side of the table and scrape away any flashing. I don't think it is a good idea to grind the under side of the table if you can do something else but if you have a bump of cast iron in the way you can grind it out of the way.
I had about .030" of clearance when done with a pocket cut to .230" deep and a extra .020" x 3/8" across the the bottom.
youtube videos of the G0704 under the name arizonavideo99