Al, We had a 42 Grand Banks that came (to us) with old-type roller shades on the three front windows. The shade had a female snap at the bottom center, and there was a corresponding male snap on the teak trim below the window. This actually worked really slick. Fast, easy to use, blocked all light, never rattled underway in the up position. When up it was easy to not realize that they were there. Just another idea. Good luck! Regards, Scott Gordon Freedom Fleming 50 #5 Shelter Bay, WA