The bolt can be seen attached to the bedrock in the centre of the photo, below the cairn. It is marked with the triangulation pillar symbol on the OS 1:25,000 map, but is not shown on the 1:50,000 (as viewed on OS Maps 09/08/16).
Uploaded to Geograph by Claire Pegrum on 31 May 2016
Photo © Claire Pegrum, 31 May 2016. Licensed for reuse under this Creative Commons licence