In the book Saints and Stones (ISBN 1-84323-124-7) Davies and Eastham describe how St. Samson was once credited with the lifting of the capstone:
…the twelve-ton capstone may have been a naturally occurring erratic, already on site, which the enterprising Neolithic engineers dug out and hoisted onto uprights. Legend has it that St Samson performed the operation with his little finger (and severed it in the process): the tomb was once known as the Grave of Samson’s Finger.