No idea about how a resistive type is build, but I did repair a hall effect type the other day
The hall sensor is fixed in place and there are two magnets on the moving part of the throttle unit.
With throttle in closed position, one magnet is very near the throttle,
As you rotate the throttle, one magnet moves away from the hall sensor, and other get closer, and the signal ( voltage out from hall sensor ) increases.
Once the throttle is all the way open, the magnet at the opposite end of travel is almost touching the hall sensor.
I imagine a pot type throttle just has a gear on the pot and a rack on the throttle grip
Mongoose frame, Fox F100 forks,26x2.3 tyres
100V 20Ah LiPo
Lyen 18 FET 65 Amp,5304 in 26 inch Mavic rim
To illustrate the vain conceit that the universe must be somehow pre-ordained for us, because we are so well-suited to live in it, he mimed a wonderfully funny imitation of a puddle of water, fitting itself snugly into a depression in the ground, the depression uncannily being exactly the same shape as the puddle."
-- Richard Dawkins, in "Lament for Douglas" (14 May 2001)