I’m doing engine swap for a personal project vehicle. I needed to punch a 3" hole through the engine bay to the trunk where the engine computer is located to route a new main wiring harness.
The sheetmetal is 1mm (approx 0.040") and, despite my best efforts, it seems impossible to deburr it to a point where it is not sharp. I’m afraid that it will cut the harness.
The hole is approximately 3". Is there a grommet that would fit this size - something with around a 1.5" ID? If not, can someone recommend a piece of grommet-edging that would work? Hopefully something not super big. A foot would probably do it.
Attaching a photo to show what the hole looks like.