This is a beautiful and well designed peephole. The picture is crystal clear. I've used silicone sealant on the outside and inside and haven't had any condensation issues so far. In fact, I mismeasured the thickness of the door. Measure the thinnest part of the door. I was Lucy, although the viewer still fits. After a test run, I reinstalled the sight glass with Loctite for a secure permanent fixation. It would be easier if the sight glass had multiple notches to make tightening easier.
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