I have two edf55 units that i have 20-30-3500 ammo BLmotors for. The shafts to do not have a D cut in them, they are round. The impeller hubs that came with the fan units have to set screws 180 degrees apart from each other. I cannot for the life of meget the impeller hub (or prop adapter, whatever its called) centered on the shaft. Can anyone help??? Please, this is driving me insane!!!

Sean

Wow you posted that a few days ago and still no help. I can try to take a stab at it. So your motor shaft does not have the flat spot cut on it correct? The part to where the set screw screws to when tightened? If that is all it is I would cut a flat spot with my dremel tool. Maybe that will work out for you. Good luck!