The capstone of Lesquite is supposed to have been thrown here by the Devil in a game of quoits (so says B C Spooner, in The Giants of Cornwall, in Folklore, Vol. 76, No. 1. (Spring, 1965).
Barnatt (Prehistoric Cornwall, the Ceremonial Monuments, 1982) says that the quoit was thrown from nearby Helman Tor. Apparently there are natural features of a ‘similar form’ at Helman Tor, about a mile away, that can be seen from the quoit.