I modified the H16 spinnaker a bit, Took it into my shop and took a little off the foot of the sail mostly towards the clew to raise the clew about a 6". I attached the turning block to the side stay. The spin hoop I make myself, I made the molds last year and have sold a few. They are the same size and design as in the link from performance NACRA. I have the bags made in florida in two lengths one for the shorter boats like mine and the other for 18'+. If you are making a one off hoop there are lots of ways to do it, one way would be to use a foam ring and glass over it.

Carl

Saylor Specialties L.L.C.
www.saylorspecialties.com