Jonathan, we had been sailing our Hobie 18 for many years before I had ever heard of or seen such a thing as "sister clips." When I finally saw a jib halyard that had them, I said, "What a neat idea!" But all they are is a more convenient and faster way to do what we had been doing for years -- using a bowline in the end of each line to attach one to the other. So you don't even need them -- just learn to tie a fast bowline and do it the old-fashioned way. When you are a sailor, it is always good to know how to do almost everything without having to rely upon new-fangled gadgets. A Hobie 16 sailor at one of our recent fleet races did not even have a tiller extension -- he used a rope attached to his tiller crossbar to steer when he was out on the trapeze. And he did well in the races, too. Not that I recommend doing this, but it is nice to know that it CAN be done.