This first image is what you never want to see or even imagine. This was the remains of a short pivot pin that we dug out of a mass of poorly applied glass mat and resin. No bolt head or nuts, just held in with resin, hence the oversize and elongated holes.
This is a common manufacturing fault.
To upgrade this we have 5 mm stainless steel plates made that sit on the bottom keel casing and the 10 mm hole is drilled to locate the original position. The kit includes the 100 mm bolt to act as the new pivot pin.