What additional method is used to keep the assembly secure while drilling pilot holes, besides spring clamps?

Cleco fasteners are widely used in aerospace assembly as a means of securely holding components together while ensuring precise alignment during the drilling of pilot holes. The fundamental design of Cleco fasteners allows them to create a temporary but strong hold on the assembly, which is essential when positioning parts that must remain stationary throughout the assembly process.

Using Cleco fasteners allows for easier adjustments and removals compared to more permanent fastening methods, providing the flexibility needed on the assembly line. This is particularly relevant in aerospace, where tight tolerances and the integrity of joints are critical for safety and performance. The quick-release nature of Cleco fasteners enables the mechanic to efficiently check alignments and make necessary adjustments prior to final assembly.

In contrast, other methods such as weights, bands, or magnets may not provide the same level of variance and precision required, as they can either be less stable or less adjustable when securing components for drilling operations. Thus, Cleco fasteners are the preferred method to maintain the security of assemblies while drilling pilot holes in aerospace applications.