Turning Stone and Robin Hoods Mark

I’ve been up on Overton Tor looking for the Turning Stone on and off for a while now.
One of a pair of rocking stones, the other was known as ‘Robin Hoods Mark’, which was 26ft round and weighed 14 tons. I’ve never come across a size for the Turning St’.
If they are still rocking, they may be somewhere amongst the mass of Rhododendruns, that run along the edge of the tor. There’s just no way thru’ them.

The rock carvings at Ashover school are about 1mile away.