Hello! How do you know which threads shouldnt have ball bearings? You mentioned that we should make sure not to get any ball bearings in the unused loops - how do I know which ones are supposed to be unused?
Most ball-nuts of this type will have 3 plastic ball re-direction fittings in them (the little red or black plastic plugs). If you look very closely inside the nut, there will be a short piece of thread/track between the middle fitting and the end fitting, on each side. This track is short, about 1/4 of the way around or less, and leads nowhere. This is the part to avoid. It helps to shine a light in there to see it clearly. I know this is quite late... just saw the video, but might help someone else😀
