I have 4lb mono on a reel and want to add a 5' fluorocarbon leader, also at 4lbs. I've tried a Surgeons knot (2 loops) and another Surgeons knot (3 loops) and a Seaguar knot that THEY say is for joining mono to flouro. None of the knots came undone bot all broke on the knot. I was careful and tied them several times. My next attempt will be tying both sides to a TIPPET RING if I can't find a knot that will work. Anyone else have this problem? Any hints will be appreciated!