Load Sensor....well the spiral usually oscillates with normal agitation, as more pressure is needed to move the load, the spiral starts to ratchet during the CCW stroke, pushing the clothing downward with each stroke...the sensing is also linked to how much turning is needed, sometimes a small stroke, or all the way up to the full oscillation with the base...
the plastic ball bearings that make it function 'adjust' for each load.....sliding up and locking in place with each stroke, only if needed...
one of the better DualAction designs.....first of all, there are NO dogs to wear out and need replacing, they are silent in operation...basically in a sealed, non serviceable unit, never had to service any one of mine....
but I did take one apart to see how it functions....
with this 50hz setup.....as with the LoadSensor, the straight vane agitator out of an Orbital trans unit works quite well also