In order to work with wooden poles, you need to drill a hole 16mm wide and about 5.5cm deep in the top of the side poles. This allows you to insert the end of the clamp into the pole. Attach our adapters for wooden poles to the central poles, on which in turn the pole caps (XL) are fitted. If drilling to 16 mm at one time does not work, start with a smaller diameter and systematically increase the diameter of the drill (e.g. 8-12-16 mm).