The file 'DC Barrel Jack Mount 5.5 X 2.1 38×10 3D Printer Model' is (STL) file type, size is 118.1KB.
How a hollow bushing connects and the holder is produced can be seen below:
https://nerd-corner.com/using-a-barrel-jack-as-a-switch/
or
https://nerd-corner.com/de/hohlbuchse-als-schalter-verwenden/
Blende35_10.STL | 294.7KB | |
BuchsenhalterSW22.STL | 221.2KB |