Received my ATN TopClimber and have been practicing in my garage. Time for me to go aloft and do some work. I purchased 30ft of 1/2 line so I don't have to use my halyard. I am going to tie the line to the halyard and run it up the mast. What is the recommend knot that I should joint the two together? I don't want the knot slipping while I am up the mast. Might ruin my day.Thanks guys.