The knobs came in ivory, brown and black. The Holiday, Tandem, Princess, Debutante and Siesta models all use them. Probably the Continental and Barber Pole too.
1. length of the shaft up to the bottom of the wide "disc" that has the metal disc embedded in it? 1/2"?
Yes.
2. diameter of the shaft? 7/16"?
O.D. = 13/32", 3/8" would be close enough I think.
I.D. = 3/16"
3. diameter of the disk at the end (outside of the plastic)? 1/2"?
15/32", 1/2" would be close enough
4. diameter of the metal disk embedded in the end? 7/16"?
3/8"
5. Exact or approximate amount of "Teeth" or grooves etched into the edge of the plastic disc on the end? 80?
60
6. How much of a gap is there (if any) between the bottom of the shaft and the edge of the contrast knob that sticks out the farthest? In other words if you look down from above, directly over the two knobs, how much of a gap is there in their normal positions?
I'm not sure what you're asking here
