Re: Impeller replacement
I'd get a new one, they're cheap, check the stainless cup that it rides in too. Put a dab of wheelbearing grease on the key to stick it to the driveshaft, slide on the new impeller, lube the new impeller with dishwashing liquid (not grease), clamp the driveshaft up top with vice grips, twist the driveshaft and push it in while turning, make sure that it never turns backwards once it is installed.