I have an 89 C30. The original clam cleat, which controls the mainsheet, needs to be replaced. I am contemplating replacing it with a Harken cam cleat, for better holding power. However, I am wondering how well this would hold, as it is impossible to see how securely it would be anchored under the cabin liner. I would feel better about this if a backing plate could be installed, but the cabin liner makes this impossible. Has anyone made this change?All insight appreciated.Thanks, Chips/v No Ma'am