When I drilled the bottom hole of the bracket to size the bit caught and I did not like the results. Basically a slightly oversized hole. The only option was to go to the next size bolt an AN4-6A. I went ahead and drilled the hole to the correct size for the AN4 bolt, but I had to order the bolt. It came in today, so I went over and installed the bolt, torqued both bolts and put on some torque strip. The image is an older one showing the bracket in place before I drilled the bottom bolt to size.