There is a layby you can park in shortly beyond the B3274 / A39 junction (layby is on A39).
Once you park you need to walk about 300 metres up the road (north) until you see a metal gate. In this field (visible from gate) is The Magi stone. If you walk up the farm track the stone is on your left but in the next field.
The stone is a small, squarish stump of a stone - not much to write home about. I assume it is connected with the the Nine Maidens as it is shown on the O/S map as The Fiddler.
Called the Fiddler on the OS map (ref SW939682) but also know as 'The Blind Fiddler', 'The Old Man' or 'Magi Stone'. This menhir is 500m to the North East of the Nine Maidens, in alignment. The menhir was broken up some years ago, with part of it lying here.
Call me a conspiracy theorist but I get the feeling that something is up with the public access to this area. A public footpath should lead to the stone but there is no stile from the main road into the first field. If you go over the field gate you are then on the wrong side of a fence and in order to get into the field with the Fiddler in it (which does actually have a stile into it) you have to cross this fence the best you can. Very rum! The field gate also has a sign close-by saying "CASC Clay Shoot. Mondays" which I found less than welcoming. I think what I photographed is the remains of the stone, which is a pretty sad and messed up affair. The field also has several piles of rock in it, along with numerous sheep.