Wooden PIN logic puzzle

LOGIC PUZZLE (Accompanied by his unique solution)
Lock the handles of a bag with this and let your friends try to open it without tearing the bag, or cutting the rope, or scraping the stick. You can also thread it and lock it into buttonholes of your friends' clothes – obviously they'll love to... unbutton it!
Learn to untie knots, but also to create them.

SOLUTION DIFFICULTY: **
MEMORY DIFFICULTY: *

With a piece of wood.

Size : length 10.5 cm and height 0.8 cm.