EE WAS INSTALLING A JUNCTION BOX COVER DURING A CRANE PM. THE TASK REQUIRED HIM TO REACH ABOVE HIS HEAD IN ORDER TO ACCESS/ TIGHTEN THE SCREWS USING A SCREWDRIVER. AS HE TORQUED THE SCREWS DO WN, HE NOTICED A TINGLY FEELING IN HIS HAND AND FINGERS. HE WAS DIAGNOSED WITH CTS.