- a mini ballhead, e.g. Giottos MH1004: http://www.bhphotovideo.com/c/product/221096-REG/Giottos_MH1004_320_MH_1004_Mini_Ball.html - a phone holder with an 1/4-20 UNC nut, e.g. JOBY's GripTight: http://joby.com/mobile/griptight-mount-only - an 1/4-20 UNC bolt (I used a round headed one)