Nagelbrett / Nail board
thingiverse
The square plate (14cm x 14cm) is 5 mm thick and holds 25 conical depressions. Nails can be inserted directly or Spax screws can be screwed in better - I used 40mm x 3mm. The nail board was securely attached to the roof of my tit nest box because a magpie consistently sat on the roof and pecked at the entry hole. After another attempt, she flew into the nearest tree upon touching the screw tips and quickly disappeared from sight.
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