I have a 1996 Beneteau Oceanis 440 that has Lewmar hatches and port lights. The ports are gray molded plastic on the inside with with a gray trim ring, gray plastic hinges and knobs that swivel to lock/unlock the opening ports. If you are familiar with this old style port, are there any available replacement knobs of which you are aware? I am looking at replacing the broken knobs, about a dozen+. Each round knob has one side that slips into a notch in the bottom of the frame to lock it shut, opposite that is what I'd describe as a small handle that is used in turning the knob and many of mine are breaking off, probably due to age deterioration. Appreciate the feedback!! Elaine s/v Marionette