Tool for tighten wing bolts on a 7A?

Hi - Does anyone have ideas on what modified 5/8 inch wrench will work for holding the far outside large nut on an 7A? I need to torch up the wing bolts, and there is just not enough room to get a standard wrench on the one nut that is very close to the leg.... It is the nut/bolt that is the second in for the outside edge of the sides of the fuselage.

If someone already has modified a tool to get to this nut, please share your solution.

Thanks,
Paul

IIRC, the construction manual says in that case you can torque the bolt while holding the nut, no? I don't recall having to use any modified or special tools to torque those bolts/nuts (but it's been a while), just sockets+extensions, etc.

I bought a cheap open end combo wrench and ground the outside of the jaw thinner till it fit well on that nut.

Thanks James. I will grind up one....