NOVELTY - The assembly (10) has a clamp body (12) comprising a shoulder projecting laterally from a head portion. A tubular insert (14) is inserted within the clamp body, where the insert includes a tooth. A threaded fastener (46) i.e. nut, is threadably inserted into the insert to engage the tooth. The fastener includes an enlarged head portion fitted within a channel of a frame rail (54). The rotation of the insert is operated to threadably move forward the insert onto the fastener and to draw the shoulder against an edge of a solar panel frame to clamp the solar panel frame against the frame rail.    USE - Clamp assembly for clamping a solar panel cell to a supporting frame rail i.e. roof, of a structure e.g. residence building and commercial building.    ADVANTAGE - The clamp assembly eliminates need for an installer to handle threaded nut, to manually start each of the threaded nut onto the threaded fastener of the assembly and to expedite clamping of the solar panel cells to a supporting frame rail. The assembly allows the installer to pre-position the assembly at approximate locations, to release the clamp assembly and to perform final alignment before the clamp assembly is tightened down, thus eliminating need for two installers to perform installations, and hence reducing expense and time required for the assembly installation. The head portion has thickness selected to enable maximum torque values to be achieved during tightening process, thus ensuring tightening of the clamp assembly and preventing the solar panel cell that is clamped with the clamp assembly from damaging by the installer.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of two clamp assemblies with a right most one of the clamp assemblies positioned on a frame rail in an elevated position and a left one of the clamp assemblies pushed down into contact with an edge of an adjacent frame rail.    Clamp assembly (10)    Clamp body (12)    Tubular insert (14)    Threaded fastener (46)    Frame rail (54)