Ribbon Penetration.
An inverted "U" shaped two wall blue panel with a hole in the center is shown on the stand.
A blue ribbon is threaded through the hole.
An inverted "U" shaped yellow plate with a hole in the center is introduced.
The yellow plate is dropped inside the panel through the slit provided at the top.
The hole of the plate matches with the hole of the panel.
When withdrawn the ribbon is found threaded into the hole of the yellow plate.
VERY well made EASY to do
Ribbon Penetration