When torquing down the axle nut after the proper belt tension has been set (deflection), the welded axle nut will move to the low side of adjuster cam. This movement will allow the belt to lose adjustment. Place this tool over the welded nut on left side with the neck portion of tool resting over the swingarm. Hand screw the adjusting screw to take up any slack in tool. Torque the axle nut from the right side knowing that the welded nut will not turn allowing the belt.This item fits the following models: 2002-2012 Harley Davidson FLHR Road King2007-2012 Harley Davidson FLHRC Road King Classic2002-2006 Harley Davidson FLHRCI Road King Classic2002-2006 Harley Davidson FLHRI Road King2004-2007 Harley Davidson FLHRS Road King Custom2004-2006 Harley Davidson FLHRSI Road King Custom2002-2009 Harley Davidson FLHT Electra Glide Standard2002-2005 Harley Davidson FLHTC Electra Glide Classic2007-2012 Harley Davidson FLHTC Electra Glide Classic2002-2006 Harley Davidson FLHTCI Electra Glide Classic2007-2012 Harley Davidson FLHTCU Electra Glide Ultra Classic2002-2006 Harley Davidson FLHTCUI Electra Glide Ultra Classic2009 Harley Davidson FLHTCUSE4 CVO Ultra Classic Electra Glide2010 Harley Davidson FLHTCUSE5 CVO Ultra Classic Electra Glide2011 Harley Davidson FLHTCUSE6 CVO Ultra Classic Electra Glide2012 Harley Davidson FLHTCUSE7 CVO Ultra Classic Electra Glide2003-2006 Harley Davidson FLHTI Electra Glide Standard2010-2012 Harley Davidson FLHTK Electra Glide Ultra Limited2006-2012 Harley Davidson FLHX Street Glide2006 Harley Davidson FLHXI Street Glide2002 Harley Davidson FLTR Road Glide2007-2009 Harley Davidson FLTR Road Glide2002-2006 Harley Davidson FLTRI Road Glide2011-2012 Harley Davidson FLTRU Road Glide Ultra2010-2012 Harley Davidson FLTRX Road Glide Custom