Coed-Pen-Maen Common

I visited this site winter (it started to snow!) and couldn’t find it. However, as I was about to give up, a couple were walking their dog and by luck they knew where it was. I can’t really give directions other than to say it is in the middle(ish) of the common and is quite small – about 2ft x 10 inches. Only the top couple of inches are sticking up above the grass. Good luck!