What he said (Richard)
I have been using ascenders for some time. I love them, they are much easier than giving the misses another shot at collecting on your insurance and hauling you up. The use of the harness, and I would sugest a second line is a good safety idea. The "stop" after the lifting line parted or the rig failed would not be fun. There are two kinds of ascenders, one has "teeth" and Gibs has a "friendlier" cam that does the same thing with less stress to the rope/line. Gibs ascenders run about 60-80 bucks each. A climbing store can also show you how to use them. The seat will be about 120. Alot less than the marine hardware needed to get to the top.There is a way with "prussik" line. but you would have to email me for that.