What tool is used to inspect flushness of both the manufactured and driven heads of rivets after they are driven?

The tool specifically designed to inspect the flushness of both the manufactured and driven heads of rivets is the gap inspection shim. This tool allows the mechanic to determine if the rivet heads have been properly set, ensuring that they are flush with the surface of the material to maintain aerodynamic efficiency and structural integrity. The gap inspection shim can help in identifying any discrepancies in height, which can indicate that a rivet may not have been driven correctly.

Other inspection tools, while useful in various tasks in aerospace assembly, do not directly assess flushness like the gap inspection shim does. For example, a rivet gauge is primarily used to measure the diameter of rivet holes or determine rivet sizing rather than assessing flushness. A spoon gauge tends to be used for different measuring purposes, like checking for the proper fit of surface contours. A height measurement tool, while it can provide height data, may not be specifically designed to check the flushness of rivets in the same nuanced way as a shim would. Therefore, the gap inspection shim is the most suitable and relevant tool for this specific inspection task.