Yesterday I removed my keel (M) to antifoul it.
As you can see from the pictures it is chipped on the trailing edge of the upper part.
When I last removed it 2 years ago there was some damage to the bottom end which I repaired but the upper portion was fine.
I have checked the slot and that does not seem to be damaged it the upper area as you can see.
I can't see how this type of damage can happen unless something had jammed down the slot which hasn't occurred and as there is no damage to the rest of the keel it seems a mystery to me.
Can anyone suggest any reasons for this type of damage please.