Port lights
Most the old Ericson used a butel tape as a gasket. On my Ericson 29, 1971,
I removed all my windows, and used 3m silicone ask my replacement. This was a huge job.
Squeezing the silicone between the frame and the boat works. Just don't tighten the screws for day
Let the stuff set up a bit.
I have did this 14 years ago and it looks good and has held.
Rick