Drivers Seat Height...

[waynester]

I have adjusted the drivers seat as low as it will go...I think? I made the mistake of slightly lifting my weight off it as I lifted the handle...& nearly ejected myself through the roof!

So..I think I have pushed it down as low as it will go, but..I still feel I am sitting to high!
I noticed a white 'knob' at the front left side of the seat, not touched it yet.. what does that do?

Any other way to get the seat a little lower?