Originally Posted by ant
Like a previous poster said, if you nail knot the leader to the line and then want to change leaders, you have to cut the line. If the line is a floating line you've pretty much killed it, as water will start to get into the core of the line and turn it into a sink tip line.
Nail knot a piece of .21 leader material to the fly line and then place a Perfection loop in it. This is a permanent butt and you just loop the leaders in and out of it.