Here Jan, try this one in the Search Box:
Rush Seats.
You should come up with several in the thread that talk about holding removable rush seats, with excellent suggestions. Holding Removable Seats by Lou Gatti on June 27, 2007 is one of them. I had to look long and hard before I found it though, no wonder you had troubles!
The Wicker Woman-Cathryn Peters-Angora, MN
http://www.WickerWoman.com/seatweavingfaq.html