There are some designs available, but not one fitted good enough for me. So I created my own, including a release mechanism, like the original Electrolux parts have.

You will need the following to put the model parts together

• A ballpoint pen spring, cut in half (diameter 4mm)
• 2x M3 nut
• 1x M3 x 4 mm Allen screw
• 1x M3 x 6 mm Allen screw

The model was created with FreeCAD 0.21.1.