Thanks for the responses. I don't see a jam nut on the outside. Does the lever just screw out when it continues to be rotated? When opening the dump valve, I just open it a half turn or so. But, if I continue, will it come out, exposing the O-ring?
I've not looked, but maybe there is a YouTube video on a rebuild. I've found other LS threads about rebuilds, but I never found anybody with a pictorial on the task. Maybe HydroGear has some pics/videos on their website.
One other thing occured to me after I retired last night. I still have the other pump, the one I replaced in 2008. Maybe I could buy a gasket/seal kit, and work on it, while this one continues to run, albeit leaking a bit. Again, a YouTube would be critical to help my meager skills.