Abstract: A mounting device includes a central shaft extending along an axis from a first end to a second end. A first collar and a second collar are mounted to the central shaft. A first portion of a linkage is attached to the first collar, and a second portion of the linkage is attached to the second collar. The linkage has an inflection point located between the first portion and the second portion. A foot pad is attached to the linkage proximate the inflection point. The first collar is movable from a first position to a second position, and when the first collar is in the first position, the foot pad is at a first radial distance from the axis. When the first collar is in the second position, the foot pad is at a second radial distance from the axis. The first radial distance different than the second radial distance.