What is a true statement regarding the setup of the drill stop?

The correct understanding regarding the setup of a drill stop is that the assembly should be secure in the vise. Properly securing the assembly is crucial for ensuring safety and precision during the drilling process. When an assembly is firmly held in place, it reduces the risk of movement that could lead to misalignment or inaccurate hole placement, which is especially important in aerospace applications where precision is critical. Additionally, securing the assembly minimizes the chances of injury to the operator, as it helps prevent unexpected shifts or slips during drilling.

The other choices focus on aspects that either do not prioritize safety or precision or are not standard practice in a drilling setup. For instance, holding the assembly with one hand is not advisable as it compromises both control and safety. Setting the drill speed to the highest level can lead to overheating and may affect the quality of the hole being drilled, as different materials require specific speeds for optimal results. Lastly, marking the hole location is essential for accuracy; neglecting this step can result in improperly placed holes, which can have significant repercussions in an assembly context, especially in aerospace manufacturing where tolerances are strict.