Yes, the end of the camshaft the auto advance is attached to is an interference fit into a ground hole in the end of the cam. The end is known as a drive quill. I was at the Pennsylvania Airheads SuperTech last weekend and talked with a guy whose quill first slipped, then pulled out. This amazed me, because I have had cause to remove them. They didn't come willingly. However, the ones I removed were from /7s-it may be that the fit had to be improved.
During a conversation with Tom Anderson (of Anderson Cams) some years ago, he told me that they had slotted the quill so air would not be trapped as it was pushed in. BMW did not do this.