Summary

I needed a way to run a cable from inside a door where it is connected to sensors and the door latch through to the door frame for the controller and look nice with no exposed wire.

I couldn't find the real part(Last photo, included as an example) and with the very flexible armoured conduit tricky to find in affordable length I made cap ends to use a long spring instead. You might be able to resize the part to fit actual conduit if needed.

Red is only for prototyping, the final one will be done in white plastic to match the door. Or you could just paint the plastic. The spring will be left silver as paint will just come off it and it'll look tacky.