If you need any measurement done for the holes that the bolt/nut sits in then let me know, I'm sure the bolt head is bigger than the nut (or vice versa) as it will only go in one way and the thin washers only go on one way as well, I'll have to take them out to see which way to be sure.
You'll also have to modify a flat bladed screwdriver by cutting out a small square out of the middle to go over the end of the bolt as it comes through the middle of the nut (obviously) and you can undo/do up the nut (sorry if I'm sounding like I'm teaching you to suck eggs).
Pete