Roland68
Major Contributor
Which part should be made of plastic on the inside? My plugs are completely made of metal and there is no plastic inside.2 out 6 I tried screwed in but not connected. And then I found inner material is plastic and lost interest.
As I said, as far as you can see the position of the grub screws in the picture, there is definitely something wrong with the assembly of the plugs.
I just want to help because I have professional experience with this and our company designs connectors ourselves and produces them with the major manufacturers, but of course you don't have to accept my help.