OK, so I bought a PowerTap Pro+ a couple months ago, and it has been great, really educational and humbling. So, recently the hub started dropping signal randomly for 10-15 minutes at a time. Drat. I called Saris and they asked me to send the wheel in for service. No big deal, I guess. But, when I went to pull the cassette, the entire freehub body came with it! I pressed it back on, along with the little retaining cap that usually screws onto the axle. Is the whole assembly really just a pressure fit? Why?? thanks for any info.