Loosen up the set screw and start by inserting the cable in the sink. Keep inserting the cable till it reaches the resistance, or let's say until the clog is gone. Now tighten up the set screw, then begin to spin in the clockwise direction with the slight forward pressure. Once all the length of the cable is inside the sink pipe, loosen off the set screw and repeat the process until the blockage breaks free. Now remove the drum auger in reverse order. This method is for manually operating self-feeding auger. The same is the method for the one with the drill.