A concave line of abrasion and polishing can be found on both one of the central kerb @-@ stones on the western end of the monument and a kerb @-@ stone on the south @-@ east of the monument . These have been attributed to the sharpening of flint and other stone axe @-@ blades on these sarsens . It is possible that these tools was sharpened for use in cutting and carving the timber levers and struts which would have been used in erecting the stones and constructing the tomb . Similar evidence for the sharpening of tools have been found at West Kennet Long Barrow , as well as later prehistoric monuments such as Stonehenge .