main line has root growth. sent camera down cleanout. pipe looks ok, no misalignment. just a small gap. rental house only has auger with pigtail. did rent a unit before that had 2-1/2" cutter. once you are at root area, how effective is cutter? does it really cut roots or just bounce around? drain plugs up every few months now. i use stiff 1" poly line to poke/push thru root area and drain opens. its 8' below grade. 8' ft from front of house. really do not want to dig a big hole and pack concrete around seam. so, what does a auger with no cutter tip really do for opening drain?