I'm the proud new owner of a '90 Catalina 25. The boat is not in the water yet, the mast is down. I'm still sorting things out. I found this attached to the bottom of the CDI furler with wire so I'm assuming that it has something to do with the furler or the mast. I looked through the instruction manual's exploded view and saw no reference to it. The previous owner had suffered a stroke and has communication difficulties so there's no help there. It looks as though it slides into either the furler or the mast but I can't figure out what it's for.