Quoted from Axl:but how do you install the head bolts?
Inside the backbox, there are holes in the bottom. Those holes match up to large tee nuts installed in the cabinet "neck". Simply slide the bolts in through the holes in the backbox and tighten into the nuts. Wingbolts make this very easy,but regular bolts with washers work fine. The latch on the back exists so that the backbox will stay in place while you are installing the bolts. The latch is not intended to be used for permanent setup.