Timothy Norton wrote:...... and some contortionist work .....
...... and some contortionist work .....
...... and some contortionist work .....
:-0
Half agreeing and half remembering my new vocabulary learned upon trying to remove the retaining nuts from behind the sink bowls. This was bad enough when I was still referred to as "the human pretzel" lol....can't imagine what it would be like today.
But in all, I agree with T.N. here and with a similar sink cartridge now going bad, will soon replace the entire faucet. My newest rendition of replacement is to rock the current broken faucet back and forth a bit to create a small crevice between the sink/gasket at the base of the faucet itself. This will render the connecting threaded pipes vulnerable to that wonder of wonders, the reciprocating saw! With a bit of luck and perhaps a mild bit of abrasion to the sink surface, the entire head is removed by cutting through the connecting pipes with a hacksaw-type blade, the cut pipes falling down from behind the bowls and you hopefully can replace connecting hoses from the shut-offs to the new faucet head much easier than trying to unscrew corroded metal or plastic nuts from behind the sink bowls. Our hard water kills faucets in about 7-10 years, so at ~$100 for a new two-handle faucet that's between a $10 - 15 per year for that unit if installed yourself. (The one good thing about hard water is that any small leaks you leave behind from your handi-work will seal shut from corrosion in a short few days! .... that advice, free of charge

) Hoping you have a master shut-off that can be used for now and for when replacing the currently defective items in your flow stream......Good luck!