If you know, you know.  One of the most problematic areas on a UH-60 is the 308 beam that will crack.  In this case the Columbian Police Department in Bogata had a few Blackhawks in this condition and needed a crew to come take care of the repairs.  Using the correct fasteners and fabrication skills allowed for a clean repair with years of trouble free operation and getting these mission-critical assets back on the line.