Hardware used:

• 2 pcs fittings for 4mm PTFE tube, thread M6
• 2 pcs PTFE tubes 4/2 mm, one 6 mm long, one 33 mm long
• 6 pcs bolts M3x16, 6 pcs M3 nuts, 12 pcs M3 washers
• 1 pc ball bearing 6 mm inner diameter, 12 mm outer diameter, 4 mm width (or utilize attached STEP file to adapt the 3D model to your own ball bearing ;) )
  There is uploaded just one STL file here. Mirror it in your slicer to get its counter part :)
  Assembly: https://youtu.be/PPvElLD6S-A