Is it an optical illusion or are the spacers 90 degrees rotated apart
That made me laugh! Maybe it needs a hole to hold a cup so it doesn’t wobble when you walk?
The spacer is a piece of draftboard set on edge at the rear of the tray to level the tray within the walker.
The whole idea of the walker is so you don’t wobble when you walk. LOL
There are many ways to customize Johnnie.