The Luxaflex Slimline Venetian cord tassel goes at the end of the pull cord of the venetian cord. To undo the Luxaflex Slimline Venetian Tassel give the top a 1/4 turn and pull it up then feed the cord through the middle of the top piece and then tie a knot in the cord and feed the top piece back into the tassel with a 1/4 turn the other way.