"Necker Knob"....Oh, man, it hurts just thinking about those things.
When I was a kid (in the late 50's and 60's) neighbor had a '52 John Deere A narrow front with one of them things on the wheel. I was hauling a disk harrow over fresh plowing, and dropped the front end into a back furrow.
I think you know what happened next. Drove with one hand for the next few days, AFTER taking a screwdriver to the knob.
The clutch on the 750 is nothing. But then, I grew up clutching Dad's McCormick Super W6, and have walked with a slight list to starboard ever since /w3tcompact/icons/smile.gif.
My problem is the lack of seat suspension. Of course, wedging my 225 pound carcass into that seat isn't helping matters /w3tcompact/icons/sad.gif