Originally Posted by robatsu

That is pretty cool. I've used the Sheldon tool, almost all the time it is ok. Actually, it has never failed to loosen the fixed cup, but once or twice, because of how the washers seat on the inside along with the necessity for really tightening it down for a heavily stuck cup, I've damaged a fixed cup or two. Not many, and it is hard, but it does happen.

This setup should obviate that risk.