Ok so no joy here?
So I went with bigger balls. My originals were .2805" and I replaced them with .280734" and I reduced the backlash to just under .002". I went ahead and ordered .280914" per my conversation with Eugene at Baltec.
Now I'm wondering if the double ball nuts need to be loaded, ether toward each other or away, to make up the difference thereby creating a anti-backlash nut. I've done this many times before on other machines I've built, but just now started to entertain the idea that these nuts work the same way.
I'm not sure if that's the case with these nuts. If they are then I'm not sure how that is achieved.
When I took them out of the lathe the spacers in between were loose so maybe the loading of the nuts from each other got loose.
From the pics you can see the spacers and two metal bars on either side of the nut. They just pop in there and are held on one side with a single screw. The hole in the other end of the bar is just threaded; I assume to use a screw to get the bar out of it's slot. It's not threaded into the nut itself.
I have an idea of how i can make it work, but not as is. So I'm asking anyone here if they have any idea of these nuts are supposed to work.