Originally Posted by MsLizVt

put the nut and bolt behind where the axle is on the left side. it's not securing the axle or skewer but just acting as a 'door stop' so to speak, to keep the axle from sliding back.

If you look at the right side you'll see the head of that bolt with the slot in it for a screw driver. It's just behind the skewer. Basically you doing the same thing on the left side. Just putting something there to keep the axle from sliding backwards.

Does that make sense?