Cherry MX "Slick Clicks"
Cherry MX Slick Clicks are a (total meme) 5-pin MX Green or Blue that has been mechanically actuated 640,000+ times to 'break in' the switch and increase the smoothness. The POM sliding on the nylon simulates years of use, creating a smoother feel just like the vintage switches we all desire - without the dust, desoldering, ultrasonic cleaning, spring swapping, and thrift shopping.
I really don't know how to lube these. If you come up with something let me know!
My prototype hotswap PLA60 with a half plate uses these in stock form.
I custom designed the machinery for this, and as a mechanical engineer you have my word that these switches are being broken in on precision machines, and not some silly "rock taped to a fan" device. This helps keep the stresses on the leaves to a minimum, as the pressing is no harsher than your fingers. The machine also introduces extremely slight oblique presses, as we never have perfectly centered and straight down presses when we type. This helps to wear the switches evenly and effectively.
Sales on worked in switches are final, as this is a product with a service rendered upon it.