Thanks GraphiteGhost and UrbanE for the pics and explanations. The problem with the bolt on the SC is that the end where you attach the socket can get distorted.
I've seen this in person. I was helping another member install a pulley saver kit on their SRT6 and we had a hell of a time getting the belt back on.
The previous owner must have used the wrong sized socket or something. Or they didn't re-seat the socket when it started slipping.