http://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=cam+buckle $15.77
http://www.amazon.com/Playground-Trapeze-Rings-yellow-Sticker/dp/B001MXFRZM/ref=sr_1_7?ie=UTF8&qid=1435529797&sr=8-7&keywords=trapeze+rings $7.55
total = $23.32 And if you still don't have a clue how to use it
https://www.youtube.com/watch?v=7GjoI2p-ob0