As much as we love Aeon Labs micro switches, they can be a pain to install. Here are the 3 key ingredients for a quick and easy set-up of the switches:
Before inserting the wire, screw the screw in a little or so it catches the thread. If you insert the wire first, the screw will probably miss the thread and get loose. It will feel as if the thread is stripped.
Make sure you have the right type of load connected to the micro switch: NO transformers, at least 20W bulbs or circuits, high-quality dimmable LEDs for the DSC27103 and DSC19103.
Match the in-wall switch with your micro switch correctly - regular on/off switch for DSC26103 and DSC18103 and momentary switch for DSC27103 and DSC19103 (no dimmers!).