This is the most effective solution for connecting the ultra fine tip of a silk line to a leader, a braided leader which is designed specifically for use with silk lines, but is equally effective for synthetic lines too. It gives a smooth transition from line to leader without hingeing.
Simply insert the end of the flyline into the braid, whip a few turns of fly-tying silk around the braid near to the end. Trim off the frayed ends and superglue to finish. Use a loop to loop connection to join the monofilament to the loop braided at the tip of the leader.