Align the other piece so it will slide into the first piece with the small peg up. I used 1" x 1" steel tubes for the crossbars. I bought it for work and I work 10+ hours a day so when JBL said it last for 12 hours it was perfect. Belle , calde , comode . Bestellung war schnell da, gut verpackt und vorbildlich zugestellt. They just slip off all the time. Ich denke anders macht man die Verzahnung kaputt. I love the height of this luggage rack. These are a good pair of wireless headphones so far. This is a cable used to charge an Apple Watch.