Apropos came with 8 oval, 3 small round, and 1 large round bronze port screen rings. After arriving in Mexico, we realized we needed them to keep out bugs, mosquitos, and no-see-ums (tiny flies that bite) since we had to keep the ports open for ventilation. The problem was that the frames had no screens, so we hastily added some fine mesh fabric by wrapping polyester thread (same as used for sails) around the edges of the rings. This worked well for the year it was needed, but eventually the mesh fabric became brittle and easily torn.

After removing the fabric and thread, I soaked the frames in a metal cleaner, then used a dremel tool to polish them. Next I coated them with Protecta-Clear. I had about a yard of bronze screen that came with the boat, so I cut pieces slightly bigger than each frame. I ran a bead of Gorilla glue on the frame, placed the screen on wax paper and the frame on top the screen, then a 5 gallon bucket of water to apply pressure for 2 hours while the glue cured. The final step was to trim the screen along the edges with a pair of scissors. Here are all 12 finished rings and a picture of one of the oval port rings in place.