Homes “Lawn and Order” episode on HGTV recently featured Postech Screw Piles used for a large deck and for tie back of  a retaining wall.

http://www.hgtv.ca/holmesmakesitright/video/season+2/lawn+and+order/video.html?v=2517023349&p=1&s=da&searchQuery=lawn%20and%20order#holmesmakesitright/video/search/lawn%20and%20order