Bryan is right, you really can leave the knot if it's q-line.

It's sleeved. Yes any knot weakens the line, but my q-lines have 10 knots in them (one on each end of each line) and I have not broken them, ever. I did wear through one that was my 5th line once tough.

Scott has even joined two shorter pieces to make a replacement line. I know this because I have one of his old bars. Q-Line is good stuff if you can deal with the sound it makes.