OK, perhaps I was a bit hasty in declaring the lad mad. I've got an STS-1000, which has a pinch bolt to keep the inner sleeve in its place (see attached). From your pic, it appears the STS-1 has no such pinch bolt. So, best I can figure is someone replaced your STS-1 tidbits with STS-1000 tidbits. I, however, am not an expert on these matters... I've only got my one bike, which while it appeared to be all original, was used nonetheless.