Gotcha! I understand now. I was thinking you drilled out the threads on the server rails. Drilling out the rack hole threads makes a ton more sense.
The adapters took me several attempts to figure out an orientation that worked for my rack. I don’t believe they are marked left or right so I kept putting them on in a way that didn’t allow holes to line up.
Here’s a few pics. I wanted to try to find some thumb screws for the rack ears, but the holes don’t quite line up with the ears.
