3/8", 1/2" or ? Here I am wandering all over the placing looking for a wrench of some sort, and then you come along and just use a "stick", duhhh. Well I have an air impact driver to get it to work, but I like your idea way better.
A piece of wood, with 4 holes and 4 screws and a looks like 8 nuts, good job.
How about a side/angle shot.