I get all my flighting from them and is all MUST be stretched. If you feel movement of the flighting on the shaft if is not tight enough. To stretch the flight weld one end to the shaft then weld the other end of the flighting to a channel that is the length of your auger and take a pipe wrench and turn the shaft and have someone hit the flighting all the way from the end that is welded to the shaft to the end welded to the channel on a 10' length you should get 3/4 to 1 flight of stretch.