Abstract: A telescopic tube and cam connecting and locking mechanism includes a first bushing having a first diameter, a second bushing having a second diameter which is larger than the first diameter, an expandable cam bushing received in the second bushing and fixed against rotation relative to the second bushing, and a camshaft having a first portion received in the first bushing and a second portion received in the cam bushing. The first portion is fixed against rotation relative to the first bushing, and the second portion is rotatable relative to the cam bushing to expand the cam bushing against the second bushing and lock the first and second bushings against relative movement. A clamp bushing received on the first bushing and engaging the second bushing has an inner diameter that is smaller than the outer diameter of the cam bushing.