CDI
I just purchased a 1984 H-27, but I had just installed a CDI (FF2 I believe) on my last boat, a Tanzer 7.5 (24.5 ft), and it worked very well. My only gripe with that particular unit was the diameter of the furling line I had to use. It wasn't much more than what would qualify as thick string ( I can;t remember exactly, but I'm fairly sure it was 3/16), and I am wondering at what point they recommend a more robust line. The drawback to the thin line of course is how it would cut into your hands if you needed to pull hard on it. Check first into what size line the recommended unit calls for. I would want something that you can get your hands on a bit better. I gave the headstay to the sail loft guy and I had them install it, for another $100, as I didn't want to chance messing it up, but I do hear it's a real easy job. Sailing wise, it's not a unit with which you would frequently want to change sails, in my opinion.