I won the battle of the seven screws. I imagine replacing them is a treat.
The (six vane) impeller is very pliable and shows no cracks nor uneven wear.
Not having a new one to compare with the used one I can’t say if it is serviceable,
I’ll play it safe and get a new one but I do wonder if all of this was necessary.
Ah to be young and foolish again instead of old and still foolish.