do a taper shocker knot.
lightly do a granny knot in the 60lb line, pass the 20lb line through the middle of the knot, then pull the 60lb line as tight as you can. pull then 20lb line though the 60lb somemore and cut away the 20lb line were you pulled the knot tight on it. then wrap the 20lb around the 60lb 7times, then wrap it back towards the knot 4times, then pass the 20lb line through a gap between the 2 lines infront of the knot pull through but leaving the wraps up the line as they are wet all of the knot with spit, then hold the main part of your 20lb main line and the 60lb leader and pull slowly tight they cut away the loose pieces of line as close as possible to the knots use nail clippers.
the 20lb wraps of line will pull tight to the 60lb knot in a cone shape and form a taper shock leader knot, i have used these in the past on abu 6500 and 7000 with levelwinds no probs