speedometer bounces?

There are different schools of thought on the proper lube for the cable in sheathe assemblies. A cable that travels lengthwise in the sheathe, like a throttle cable, should not get grease because it could restrict the movement. A cable that spins in the sheathe can benifit from a grease that will fill voids and absorb / wick away the heat generated.
What the factories engineers used in the different cases should be a guide.