I have the Plumb4orce Two Handle 4" Lavatory Faucet P4B-400CL installed in my bathroom sink. You can see the exact specifications for how it is put together at this link. Only a few weeks after installation, the hot water knob started getting harder to turn. It is now months later, and the knob now requires a lot of force to turn. I was told that I needed to apply plumber's grease, so I bought some (the lithium variety, to be precise). The problem is that I am confused by the currently available information regarding how to properly apply it.
There are some tutorials (albeit shockingly few for two-handled faucets made similarly to mine) available on Youtube, such as the one linked to here, which shows the rubber ring and the bottom of the cartridge being greased. But I invariably see comments below such videos stating that the videos are all wrong and that the rubber ring and/or bottom of the cartridge are stationary and that greasing them thus doesn't help. This confuses me, as I don't know what to believe.
I have also found written tutorials, but they don't include photographs and use terms that I do not understand in the particular context of greasing a faucet handle (I recall some saying to grease the "threads", for example, and I don't understand what that means in this context, as I see no "threads" anywhere on the cartridge).
In short, what I need is an accurate, clear, precise description of what I need to do in order to grease this faucet handle. I would especially like pictures and/or video included, but even a clear enough description in layman's terms would probably be enough.