As per Pittdog, l will be buying 2 new impellers and installing them after l give the hole the shaft rides in a thorough cleaning. Hopefully my neglect has not "wonked" the holes the shafts ride in too severely. I have had the motors off 2-3 times in the last 7 years (not nearly enough of course) and gave the impeller and shaft area "quickies" so really l have nothing to complain about. The filters have endured "me" so to speak!