Abstract: A button assembly is provided that includes a plug, a button, and a biasing member. The plug can be received in an inner pole section. The button is slidably received in the plug for movement between a locked position extended from the plug and an unlocked position retracted with respect to the plug. The biasing member biases the button to the locked position. The button has a land region, a cammed region, and a locking edge. The cammed region slopes from the land region in a direction towards the locking edge. The land region is remote from any pinch point formed between the plug and the locking edge.