once you put the top part on or "corkscrew" there is a center piece that the dogs are attached to, just insert it in the center, there should be a grove to line it up, make sure the dogs are facing up, it can get kind of tricky b cuz the dogs can fall out while ur trying to get it in place. it should just snap in place, you will see a little tab at the bottom that it snaps into. once it is installed in the machine the bolt at the top should pretty much hold everything together.