there should be a hole in the center shaft of the snout, it sits down in there, to keep the 2 shafts aligned, make sure it sits flush tho because if bolth shafts are not toutching it will snap that little screw and then well you will be screwed it took me a few go arounds to figure out how it all worked but once you start using it it works pretty slick, and dont worry i thought i was going to break something as well