BT7819-888 mounting instructions 1 BT7819-888 mounting instructions 2 Assemble the ball-joint mount before installation on the pole. 28 11 35 Drill holes on the Ø50mm (2”) pole. *For the poles that are not supplied from B-Tech. 3 Slide the collar and ball-joint onto the pole. 9 Ø10.5mm 1 2 10 Diagram A Diagram B Diagram C Diagram D Slide the collar on the ball-joint bracket (Diagram A).