The Little Wonder Xtra - edger

has single wheel. Gooseneck handlebar style handle with motor mounted in middle of unit...looks like a devinig rod or something...Photo ahown at this site on forst page of the Qwners Manual:

http://www.littlewonder.mobi/pr-pdf/04_edgers/04_06_pn100700.edger_manual.pdf

Also called "the Yardstick" in a old review article with a photo of it in use at:

http://www.extremehowto.com/xh/article.asp?article_id=60208