steel coil springs generally all have rising rates.

the more you compress it, the more resistance it will provide.

turn the dails up towards the pillow mounts and the rates increase. how much by? i have no idea.

the rate of incease is not huge, but enough to make a difference.

ei aaron, the click thing, really ar? knn, never tell me when i put mine on... i crank up to full quite often...