They don't even list a number on their website any more.
Probably a left handed screw.
So I removed the cover. The screw is in the middle of the fan. Obviously that is part of the problem. How did you get the fan off?
Got it. Vice grips and strap wrench. So the part of the seal that sits in the impellar literally melted. When I lifted out the rubber (?) part the metal ring extending from the female threads on the impellar was no longer in-tact.
Chris by email had offered to replace the pump under warranty. Maybe he can just send a new impellar. I've cleaned the shaft and all looks OK otherwise.
Take him up on the pump replacement. It's worth getting a new pump and not having to deal with anything let alone additional potential issues.
Have no fear. Reason is here!
I was just frustrated. These pumps fail catastrophically after 2 yrs or less. Without exception. This has to be my 12th time shipping a pump to him since starting a large system in 2005. Even with the better carbide seal I replace their cheap one with. By the time the seal leaks (in this case 48 hrs tops leaking) the pump is entirely shot.