I will try my best to explain the problem. I am installing exterior metal boxes (round) for outside lights. I planned to put a clamp on the back of the box where the wires enter and exit. However, after going through 1/2" osb and 3/8" siding, there is no way I can get to a normal clamp to tighten it. Do they make an extension for the clamps, like a 1/2" pipe nipple? Whatever I do has to pass inspection.
Thanks in advance for the advice!