The Hot side valve is the leaking.
First removed the handle then loosen the large nut (1 & ¼”).
One upside of my hobby of collecting tools is that I have a 1
& ¼” wrench handy.
First problem is debris caught in the valve seal area.
It’s a white plastic material. I don’t know where it comes
from but it has to be from the water supply.
I took apart the Cold water valve too so that I can compare it to
the Hot valve.
Notice that there’s a nut at the RH end of the assembly.
This nut is missing (!) on the Hot valve.
Also the lavender colored seal at the end is one that I installed
in a previous repair.
Close-up of the nut. I neglected to take a picture of the
Hot valve’s end with the missing nut and the corroded stud.
Oh well…
Some more white debris was found inside the Hot valve assembly (I
took it apart to find this).
This is the Hot valve after the repair (cut new threads on the
remnants of the stud, cut the rubber washer thinner & installed a nut).
I happened to have this very small castle nut in my hardware
stash.
The black coned shaped seal near the nut was cut thinner (using a
sharp utility knife) to expose more of the corroded stud that the nut goes on.
If I had not cut the rubber seal thinner, I would not have been
able to put the nut on.
After I put everything together & reassembled the faucet to
test it, it still leaked(!).
I took it apart again & found more white debris on the
seal. I cleaned it out and reassembled.
The valve didn’t leak but the large outer nut was leaking.
I adjusted the compression of the larger outer nut on the faucet
and in the end I got it to seal OK without interfering with the valve rotation.
