The tub/shower diverter rod has become rather stiff. Believe the unit is a Pfister based upon the unit used in another bath.
I've been using vinegar to free it up which has had only limited success. Might something like a light machine oil help?
Is this part exposed to water? If so, need a lubricant that is less likely to get washed away. Without seeing it, I'd consider spray white lithium grease.
They make a waterproof lube that might work> I use it on the O rings of my pool equipment and other neoprene connections. Ought work on the diverter
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