Re: Reaching hooks for Spinnaker sheets?
Okay, so it looks like the book I have uses a 470 for many of the diagrams and a lot of the pictured examples throughout the book. For those who are wondering, those pictures came from "Small Boat Sailing" by Bob Bond and Steve Sleight.
It looks like what I'm talking about might be a set of clam cleats placed near the shroud chain plates. I think these are used on a boat with spinnaker bags (non-shoot boat). It sounds like the ends of the sail are pulled out of the bag and cleated so the sail is ready to be raised.
Here is a small description from the book I found on another page:
"The two clews and the pouch, and the halyard is fastened under the reaching hook if the spinnaker is to be hoisted again soon.