Early 90's Sidestay Chainplate Design

Jan 24, 2011
49
Hunter 30-2 Lake Champlain
1990 H30 Anyone know how these work? I'd like to be able to lift the deck plate to squeeze some fresh sealant in since the mast is down. On both sides the ss rod wiggles around a bit, I'm assuming because the system isn't under tension. If I loosen the ss nut above what looks to be a large turnbuckle, the turnbuckle appears to turn freely. Anyone know what's hidden behind the liner here?
 

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