Originally Posted by
smd4
I don’t know about you, but my index housing ends in a ferrule—which doesn’t move. The cable end doesn’t contact the adjuster directly.
Anyway, even what you describe won’t screw the adjuster deeper into the derailleur body. The physics just isn’t there.
So. I guess you're saying that Shimano wastes money because their engineers are a bunch of morons.
In any case, this thread, and my posts within it, isn't an about the necessity of these parts. It's simply an explanation of what they are, and what they (supposedly?) do.