Still using a 4 mm Teflon tube—the standard size commonly used in printers—I cut about 50 cm in length.

Insert both ends of the tube into this fitting👇 until it’s fully seated, then secure it with self-tapping screws (the holes are already provided). Alternatively, you can remove the coating from approximately 10 mm at each end of the Teflon tube and glue it into the fitting.

To use it, first screw one end onto the base, then loop the tube around the neck and tighten the other end. Removing it is equally straightforward—simply unscrew the nut on one side.