You might not be willing to go this route but how about just putting it in there where you can see, above the floor of the anchor locker...not perfect, maybe a little high...but is anyone going to care? Probably not. Then fill the old holes with epoxy...done.
I went through the same thing...the problem is you have to cut a big whole, because of the angle the eye under the anchor locker floor...you'll see when you get in there.
