I have a Korilla 3 I got used that has never worked properly since I got it. It would either stop spinning or spin backwards. Seller said they worked perfect >:(
I figured out a fix, I took a piece of airline and cut it to fit over the shaft in between the blade and the cage.
Voila now my korilla spins the right way. I need a little smaller diameter airline as it is a little big around and can jam and stop the pump from starting but a little touch with my finger and it goes np.
Bruce
good to know, i would have not thought of that