If you are talking about a flex auger, a sort of coiled spring inside a PVC tube, it is critical that the tension on the spring be set right. You simply stretch the spring the correct amount for the length of run you have and bolt it down. You can estimate whether you have too much tension or too little by seeing where the PVC is worn through. If it is on the inside of a curve, too much tension, outside of a curve, too little.
We have a Flex-flow brand and I found a local dealer through the internet.
Also, these spring augers generally don't work for left-hand curves. A left hand curve will wear out the PVC curve in no time.