I feel like I'm missing something? My 1984 Hunter 25.5's pop top does not come with a way to secure it open? I can be sitting in the slip with the top open, and if a wave comes through it slams shut. I know it's only a matter of time before it hits me in the head and knocks me out! Do I have to tie it open? Seems like they would have built it with some sort of locking mechanism, so maybe mine is missing something? Any suggestions are greatly appreciated.