lv2, I would agree with what you said. Look at the two pictures posted in this thread. I was addressing YNOT's linkage as the "swivel/Ball" linkage.
To me it APPEARS that his linkage is the kind mostly seen on a throttle (metal ball with a plastic socket around it). I cannot be 100% as I can't see the back side.
All I said was that I had seen it debated a few different times on this board. I was careful not to make the statement that any linkage was or wasn't good for a certain application.