I brought back to life my grandfather’s circa 1993 Kenwood DP-R4450 five disk CD changer this evening. The disk tray would not open when my grandfather gave it to me. After much disassembly, I found that the drive motor has a small belt. That belt had stretched out over time. I found a suitable O-ring at a local auto parts store that fit the bill. It is now happily playing an Apocalyptica CD. 🙂