M_Boats: Spinnaker Stuff

I have modified an old spinnaker a buddy gave me some time ago. It was a little big for the 17. I flew it the last three days and love it. Man, it can keep a guy busy when you are solo. I have been using temporary lines for all the controls. What I have been wondering is what folks have done to modify the masthead for a spin halyard sheave? I am going to have to come up with something. Tim D Okanogan Lake BC M17 369 Puff.