Foreword - 6 SK500 Operator’s Manual SK500 Operator’s Manual Issue number 2.0/OM-1/05 Part number 054-091 Copyright 2003, 2004, 2005 by The Charles Machine Works, Inc. , Ditch Witch, CMW, AutoCrowd, Modularmatic, Jet Trac, Roto Witch, Subsite, Fluid Miser, Perma-Soil, Power Pipe, Super Witch, Super Witch II, Pierce Airrow, The Underground, and The Underground Authority Worldwide are registered trademarks of The Charles Machine Works, Inc. CMW