portlight

Hello, After dro, I mean getting rid of (...) one of my old portlight on my columbia29, I got a nice Lewmar opening light as an upgrade. Here is my concern 1- the wall might be about one mm to thin (maybe). Can I just use any material as a spacer? I was thinking of cutting and gluing some...

Does anyone know where I can get replacement fixed portlights for a Laguna 26? Is there a custom portlight manufacturer out there?