On Jan 8, 6:47*am, wrote:
Did you try calling them up again and describing the new problem? * Or
taking what you have to a local plumbing supply house?

Few plumbers can help you because you have a high end bathroom
fixture.

It's probably made by Harden who would take Symmons Temptrol valves
and customize the stems making it longer, thinner, and with more
splines.

Your best bet is to throw it away because Harden went out of business
and I doubt you'll find such high end legacy replacement parts on the
Internet.