Swaybar link trouble

I put my BDS 3 inch kit in almost 2 months ago, and it included extended sway bar links.
I noticed that the bolt holding the link onto the sway bar was loose, but a wrench wont fit in there, and neither will a socket, the wrench is just too wide.
http://inlinethumb57.webshots.com/15224/2795087360107286125S425x425Q85.jpg
It's loud on the road when turning or when hitting bumps,
Any easy way to fix it?

The pic isn't showing up on my work computer but if the bolt has a head you could normally get a wrench on you could try using a flat tipped screw driver wedged in between the head and whatever is next to it and then tightening the nut normally.

or undo the bolt going sideways through the upper part of the link, then use a socket to tighten the bracket

got it thanks guys

i would have just wedge a big flat head or small pry bar in there to stock the bolt head from spinning.