Lol!
I'm the one that should be embarrassed - I've been there, but didn't notice them....
In my defence, it's just occurred to me that I didn't even know what a polishing stone was at the time! Lol! Plus I was only there for a few seconds as I had a dog at the time & as soon as I arrived I realised there was livestock - cows I think - in the field so I buggered off pretty damn quickly!
love
Moth