At approximately 12 minutes into the episode, Chester P. Runk is shown using what appears to be a screwdriver on the screws of the isotopic sensor. The tool he is holding isn't a screwdriver though, but a scribe or awl, which has a pointy, almost sharp tip which would not be able to do anything with a screw. It also appears that he is twisting it back and forth, and not in one direction as would be necessary to either tighten or loosen a screw.