There's 4 nuts on the back. All of which for me were a pain in the butt to remove. I want to say that they were 3/8ths, but I can't say for sure. The therapy seemed to have help me forget some aspects of removing the beast

The nuts are located at 10:30, 1:30, 4:30 and 7:30 if compaired to a clock face.I had the most trouble with the 7:30 nut because of the brace and the nut's close proximity to the cluster gauge right next to it. It can be done, I promise!