For anyone who is curious about the Westalee Adjustable rulers with a locking fabric guide
here is a link to video demonstrations from Christine Abela of Gecko Gully.
The rulers were invented by an Aussie quilter, Leonie West and won the New Inventors Peoples Choice Award for 2008 .
http://www.geckogully.com/index.php?act=viewProd&productId=349
