What does this knob on the seat do?

I cannot relate to Mr Ride about that. Most everything I have driven had the seat that came in it. Believe they have Lazy Boy rocker recliners with lumbar, neck support, adjustable air for the tush, arm rest, heat, a/c etc. Do not know how he stays awake to drive and or how his wife stays awake to be sure he is awake.
Well maybe I did stretch it a bit but they earned those seats, glad they have them.

 

Its the ejector button, dont touch.

 

This new Pinnacle seat is different. It barely slides or rock. At first I thought it was locked in, till I did lock it it. It rocks just enough to absorb shock. It will slide a lot if forced to. Has a long track. Same with height. It’ll go almost as low as a lo ride base. Still won’t bottom out. That’s why I bought it. Advertised a s virtually eliminating bottoming and backslapping. So far it’s true. It has topped out a few times, when I had it pumped up good. Bad roads and bad shocks contributed also. I can live with topping out. It’s the other that causes serious back problems.