It's this bolt
                Senior Airman Elizabeth Shook and Airman 1st Class John McLaughlin change the clutch on an air conditioner Aug. 18, 2010, at Whiteman Air Force Base, Mo. The Airmen are aerospace ground equipment technicians with the 509th Maintenance Squadron. (U.S. Air Force photo/Staff Sgt. Jason Huddleston) 
                
                    
                        PHOTO BY:
                        
                    
                    
                        VIRIN:
                        100818-F-1232H-927.JPG
                    
                    
                        FULL SIZE:
                        1.85 MB
                    
                 
                
                
                        
                        
                            
                                
                                    CAMERA 
                                    N/A
                                    LENS 
                                    N/A
                                    APERTURE
                                    N/A
                                 
                                
                             
                            No camera details available.
                         
                        
                            
                                IMAGE IS PUBLIC DOMAIN
                                
                                    Read More
                                
                                
                                    This photograph is considered public domain and has been cleared for release.
                                    If you would like to republish please give the photographer appropriate credit.
                                    Further, any commercial or non-commercial use of this photograph or any other
                                    DoD image must be made in compliance with guidance found at
                                    https://www.dimoc.mil/resources/limitations,
                                    which pertains to intellectual property restrictions (e.g., copyright and
                                    trademark, including the use of official emblems, insignia, names and slogans), warnings
                                    regarding use of images of identifiable personnel, appearance of endorsement, and related matters.