The item failed at a time when it wasn't being used for its life-saving characteristics, it was an innocent bystander in a small crash which resulted in the damage.
I think I'm going to have to tell you.
The contraption is a metal straightener. The item of metal is a boat stanchion (that's a pole that sticks up from the deck and has wires through it which go along to the next stanchion and stop you falling over the side). It was bent when coming into contact unexpectedly with the anchor of another boat on its roller.
What's interesting is that Uncle James could not bend the stanchion pin back into shape at all, it was completely resistant to any force. How it got bent in the first place, rather than cracking the GRP of the boat, we'll never know.
EDIT - whilst I was typing that post two of you got the answer right. Well done!