I know just about every detail of the steering wheel knobs---most in our area/age were on tractors, they took several turns of the wheel to make all those sharp turn arounds and also operate hyreaulic(or hand lift) cultivators,moewrs,etc at same time---also very useful backing up wagons---anybody else ever do that?
Some were wooden, some metal, even some had ball bearings in them
I even to this day have one on my John Deere lawnmower/snow blower