Thanks to you both. Saves me the embarrassment of going into Foxes and waving my arms and talking about little plasic flaps. "Dingy center board slot" and "mylar" will make me sound much more like I know what I am talking about. A trick I seldom accomplish.
-------------------- If I show you yours, will you show me mine?
http://www.yourboatpix.co.uk Perhaps there is a picture of your boat there already.