{HE RTS: 21280 Mini Pro XL.Grip Holder {No Logo] ey 23625 20mm Metal Ball 28 to 25mm Ball 21225 17mm Ball to 28mm Ball 22156 Biz Mount 3” Shaft 23514 25mm te 2mm Flexible Extension 22191 Extra Long Pole for HDUDB 22192 HOODOO Ease and Hex Key Only Loosen the knob to insert the ball joint, tighten to secure it afterwards.