Sorry I did not explain it right. Yes their is a slight bit of play if you put pressure on the sides of the disk, that is OK.
But what I meant is on the face of the disk if you can rock it by pushing down on each side, the brass bit is worn and should be replaced.
I have purchased them from Yamada.
You may not see them listed.
I E mailed him and explained what I wanted, when I ordered the brass shafts.
Fran