On a fiberglass boat? The builders musta used cheap bolts.

And notice how the stern had to be squared off so fat lubbers can
crawl and flop aboard a stage.

Hey Robspirt... couple of tips here.

http://www.oceanfenders.com/pp9.jpg

A proper shaped stern ......And rubber baby bumpers that you can order
and get before you Un-shrink wrap your daysailor.

Joe