Removed left doubler, deburred holes and dimpled. Used a unibit to open coax connector hole to 9/16”. Used mini brake to put a bend in the end of the doubler. Taped off the fuse where the doublers will attach, scuffed up the skin and cleaned with MEK. Scuffed up the doublers also. Used an Alodine pen (instead of NAPA 7220 primer) to cover the fuse skin and the doublers—didn’t want any grounding issues with the 7220 primer.