Impressive building technique and a great thing that these places are still standing after hundreds of years, but.. The question that immediately came to my mind is; did it actually keep the mice out? I have seen many mice while living and working in Amsterdam and these tiny guys seem to get in and out of everywhere, even on vertical and slippery objects.
Did you find out if it really worked @kus-knee?
I don’t know the answer to your question.
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