In a false twist unit, a fixed bracket on which a supporting plate carrying the tube is pivotally mounted. The plate also carries drive whorls which are adapted to engage a tangential continuously moving belt. Spring means urging the plate about its pivot is also provided. The bracket is provided with a pair of spaced bearings and the plate is selectively mounted in one or the other of the bearings whereby in one of the bearing means the plate is fulcrumed to cause one of the whorls to engage one side of the belt and in the other of the bearing means the plate is fulcrumed to cause the other of the whorls to engage the other side of the belt thereby reversing direction of rotation of the tube.