When using small diameter line and a float with spring I found that it could kink or cut the line and make it weaker at the point it attaches. I have always used a nail knot for my slip floats and now I also use this knot with my clip-on floats. I leave one tag line long enough to clip the float to it and never attach the float directly to the line. This allows the float to still be moved up and down by sliding the knot and it does not cut the line.