As long you learning it is not a waste of time. Maybe it will help in later adventures.
Especially with the trouble I had, and the amount of time it took to figure it out.
Note to self, do not reinstall without putting the black over back on.
I'm not sure what's hanging up in there. But BB could probably use some sort of hard plastic washer or a limit sensor in there somewhere to keep it from binding up. But this model is a fairly old model. Maybe they've solved this problem by now.