A-727 small metal debris in pan - rebuild?

There is a new twist to the story... Please see pics
The shuttle valve primary spring has a piece of tube inside, this looks alien and must limit shuttle travel. The ends of this tube are mushroomed over and worn badly.
On page 44, Monroe says that "The shuttle valve controls kickdown "feel" by restricting how fast the fluid is released from the front clutch pack and the outside of the front servo".
I don't see this piece in Monroe's book; has anyone ever seen such a thing?
Is it potentially from a shift kit mod?

ShuttleValvePrimarySpring-1.jpg

ShuttleValvePrimarySpring-2.jpg

ShuttleValvePrimarySpring-3.jpg