Abstract: A tufting machine having a yarn feed roll attachment wherein the rolls are driven by a chain drive and having an adjustable tension applying device including a housing having a yoke defined by two arms separated by a slot. The arms of the yoke include planar interior surfaces which cooperate with a planar support plate and at least one connector which locates the housing of the device in a fixed position relative to the support plate. At a second end of the housing is a guide which preferably rotates about a guide axis. The guide axis is preferably perpendicular to the plane of the support plate, when installed.