My boat is out of the water right now while I wait for a sail report to be finished so I was looking at the old do-list.
When I got my 19 the port hole glass was milky white. Here is how I replaced the film between the panes to restore them.
I removed the port holes and this is what they all looked like:
To remove the glass, you have to unscrew the inner ring. I tapped on a driver at an angle until it started to turn (I had sprayed it with WD-40 and let them sit for a while first):
...and out it came:
Then I carefully pushed out the glass:
It's a little hard to see in this picture, but the two panes are separated by a sheet of safety glass plastic.
I used a razor blade to start the separation of the two panes of glass and came apart pretty easily once started. Peel off the old plastic:
I soaked all of the copper parts in a solution of vinegar and salt:
Then I scrubbed and rubbed. I actually backed off a bit on this because I was marring up the copper a bit. I figure a little patina gives it some character. This is about half-way done:
I used 2 Mil Clear Safety Window Film 24" Wide x 1yd. Sold by the yard as one continuous roll. It cost me about $14. I forgot to snap a picture of this part, but it's just a matter of cutting the plastic and sandwiching it between the panes of glass. I used a bead of marine sealer (but not one that holds permanently like 5400) in the groove closest to the outside wall and screwed back in the retainer ring.
The finished product: