I recently purchased a 21 EC from the original owner but he stated that there were never any screens in the 4 ports. I have also talked with the factory, they state that the screens came in the ports and are not removed for shipping. I believe that the screens were missing from the time of original purchase. All 8 of the screen holders are present. I am looking for 4 brass 6" screens, but can only find aluminum frame with plastic screens (from the vendor the factory gave me). They will work but will not look authentic. Does anyone know of a source for brass frame port screens? Thanks, Jeff