When I bought the Clara Ceiling Lamp I got warned, that it's kind of tricky to install it. It would "break" easily when connecting the wires. Never would I have imagined, that you basically can't connect the lamp without the socket breaking off. (Especially for a lamp in this price segment.) I'd call this a design flaw.

For being able to install the lamp I not only soldered flexible stranded wires directly to the circuit board but also designed and 3D printed a cable relief. 

You can download a .stl file here to 3D print the cable relief yourself. It's designed for a 2 x 0,75 mm² flat cable.

To mount the cable relief, simply remove the screw the cable points to and fix the cable relief with a longer screw. 

Unlike on the pictures, the stranded wires cable should be longer (about 30 cm). You can then connect the wire of the lamp with a clamp to the cable coming from your ceiling. Don't forget, LEDs have polarity.