I asked then at the entrance to the article. After nearly a year in winter in January 2013, a clack ... and ironing the mouse had been caught in the middle.
I baited them with a piece of Gauda cheese, the dried up but in the year of the waiting period, which did not disturb the mouse.
The case triggered reliably. The mouse had but amazingly, managed from the central circular opening to destroy the cheese almost entirely before the bracket then triggered ...
In January 2014 again exactly the same scenario.
