That is a good tip. I've been chasing all the threads but I hadn't thought of paying special attention to that location. I've been pulling cores apart all day. Once you start doing a bunch of them they go pretty quick. I did notice that one of my cases had multiple threaded holes stripped out of it so someone really treated it rough. A couple of the other cores appear to be all original. It doesn't look like they have ever been apart. All the original little clips and brackets are still there and no sign of abuse anywhere.