I just went through that. I found a single 12mm allen wrench at Sears. I had to use a short cheater to get the right side nut off. It was pretty tight. To back it up on the left side, I found a (close enough) nut in my toolbox and caught the edge with a cresent wrench. I tried to find a 12mm hex drive for my socket wrench, but the biggest I could find is 10mm.

Cody

I was born a long ways from where I was supposed to be. - Bob Dylan