I, too, went the btjetman route by drilling out the existing hole to a 1/2" and made another. It was super easy and the only reason I did it this way is bc I liked the look of it better, that's all.
There is nothing wrong with the original design from Move Over Motorsports, trust me. I tried that way first and it was functional. I do not have torque specs, I just clamped down as much as I could and I had added some loctite to the bolt before threading on the nuts. Once it dried = locked on.
Here are some quick pics from my install.