Cue
Well-Known Forumite
Today, I fixed a pumped shower. Every few years, the pump shaft seal seizes strongly enough to stall the motor. It is designed by somebody who has never taken anything apart to fix it, and is a real struggle - only just doable. This is about the fourth time I've had to do it and I've modified it a little bit to make it easier next time.
I would have replaced it after the first time, you have far more patience than I.