@Beagles assuming you were not making fun of my comment, yes. I just don't get it why would you create an extra knot with a piece of line that you need to check every time you let it out...
So, you cut the amount of lead you are comfortable with, i.e. let's say 6 inches, and use that empty sheath for a uni-to-uni to the backing and put a small tiny-tiny-tiny drop of super glue on the coils and smother it in. You are welcome to read one of my previous comments, where I have a setup with either uni-uni or spro swivel.
Both have been reeling up to #25 kings, no issues.
I highly recommend going with the swivel on the
leadcore-to-leader side so that each time you need to change a top shot, you don't need to re-tie the uni with the lead core sheath. Tight lines.