TM 9-2320-209-10-1 FRAME 2 1. Boring in disintegrated shale or similar rock requires sharp auger blades (1). 2. If boring seems slower than usual check auger blade (1) and point (2). If either or both blade and point are badly worn replace them. 3. Blades (1) may be good for only 5 to 7 holes when boring in this type of soil. 4. Auger points (2) may be good for one or two more holes. 5. If there is too much vibration in derrick tube (3) when boring tell organizational maintenance. GO TO FRAME 3 4-348