The house wrens here are determined little buggers even with a 1 1/8″ hole reducer on a box it tries to fill the box up with sticks. Knock on wood so far I have seen nor heard one this year. I haven’t tried a spooker on the dee box but have a hold reducer on and wren guard also.
When the new wears off the old shines through
When The New Wears Off The Old Shines Through.