and one of the idler wheels to override backward drive within this concept the slave sleeve although concentrically mounted can be made to always makes contact with the formation at 180 deg or directly opposite from the offset blade on the front sleeve to ensure this the offset blade on the eccentric sleeve could deploy an expandable shoe pad whilst in the oriented static position 6 bearing mounted slave sleeve this can be fluted with either straight or left handed spiral 4 bearing mounted offset sleeve this can have a larger and or wider offset blade to the other blades on the tool 61 the flexible housing body with a through tube to aid as a restoring force 82 operating mechanism not shown to act onto one or the other of the sleeves either a friction braking force or locking force or allow complete freedom of movement the centres of the idler wheels gears are not forced to rotate circumferentially at the same speed as the main body mandrel the idler wheel gear is independently mounted in this case the drive between the two sleeves can be shared between two or more idler wheels gears mounted on a collar that is free to rotate independently of both the.