Abstract: A clamping apparatus for clamping an object to a member having an opening therein and marginal portions defining, in part, said opening. The apparatus includes a first member engageable with the object and having a first threaded portion. The first threaded portion is in threaded engagement with a second threaded portion complementary to the first threaded portion, the second threaded portion being on a base member having first and second opposite side portions. The apparatus further includes engaging members for engaging the marginal portions adjacent the opening, the engaging members having distal and proximal end portions, the proximal end portions being pivotally connected to the first and second opposite side portions of the base respectively. The distal end portions have respective contact surfaces for engaging the marginal portions about the opening.