The optional handle is installed with the four long bolts and black nuts in your tool kit. The backing for the handle is usually shipped in the tool kit. We like the handle just in front of the strap clip eye but you can position it wherever you want. Make sure to tighten the 4 bolts evenly to avoid stress cracking the handle base. If  you ever need to replace your handle base, we have a solution at http://multipowertools.com/support/handlebase/