An adjustable mounting apparatus includes a mounting post having a ball at one end. Opposed clamping members clamp the ball from opposite sides of the mounting post. The clamping members engage the ball with line contact. The clamping members are at a fixed distance apart from each other on a first side of the ball. An adjustable locking member secures the clamping members together on a second side of the ball for loosening and tightening the clamping members about the ball. This allows the clamping members to be rotated about the ball and tightened thereon. A mounting fixture is secured to the clamping members to allow devices to be mounted thereon.