At the risk of stating the obvious: Barb goes through the insulation, then into the hole behind it.
Is that before or after.....Duct tape.
Just don't pound it too hard, Kiwi, don't need any bruised knuckles, or dents in the firewall, LOL!I am going to try that
Thanks I will be working on that once I get settled into new homeUnder the black plastic box that holds the wiring across the firewall are the holes that the plugs used to sit in. You shouldn't have to drill any holes unless its been hanging a long time