I did a basic pressure check , it was holding steady at 60 psi and I did a noid light test at the same time. All good. I don’t have that flow test unit pictured , I did flush the fuel rail when I replaced the injectors.
The idea with the air hammer is to let the vibration do the work. Dull the bit or cut a long Phillips screwdriver and use it in the air hammer as a dull drift.