That looks right to me. There's a stopper ring on the axle that the big nut tightens out against. You can't see the stopper ring in the picture, as it's under the edge of the big nut. The nuts have left hand threads so when you turn the big nut clockwise, it locks against the stopper ring and pushes the threaded sleeve in against the brake rotor hub. Then the smaller nut locks against the big nut.
Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!
You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
Last edited by Helmut; 06-15-2011 at 04:11 PM.