A mounting apparatus includes a mounting pin having first and second ends, and a support having first and second sides. The support includes a passage between the first and second sides for receiving the mounting pin so that the first end of the pin protrudes from the first side and the second end of the pin protrudes from the second side. The second end of the pin engages an article to be mounted by the mounting apparatus. The first end rotates the pin about the axis of the pin to vary the position of a mounted article. A clamping plate clamps the first end of the mounting pin to the first side of the support for securing the rotational position of the pin with respect to the support.