After reading every single review, I decided those that had line feed problems might have gotten a defective one and went ahead and purchased this one. The two cheaper ones than this weedwacker had all kinds of reviews, left and right, about bump and feed, line feed problems. This is the 3rd cheapest weedwacker that I found on Kmart or Sears websites. Wow! Talk about AWESOME auto line feed! This thing had ABSOLUTELY NO PROBLEMS whatsoever with the auto line feed mechanism. 1. Pull the trigger with the weedwacker not trimming and release the trigger. 2. When the rotating head gets very close to stopping, you'll hear a thudding click. 3. Both your cutting lines just got advanced 3/16". 4. Broke your cutting lines down so short? 5. Make sure you're not trimming and barely/very quickly pull the trigger. 6. The rotating head will barely spin. 7. When it gets very close to stopping, you'll hear the thudding click that advances the line 3/16" 8. Do this barely/very quick trigger pull, wait for the rotating head to get very close to stopping, and the thudding click auto line feed sound over and over again until you hear the line getting cut by the blade on the shield. 9. With the barely/very quick trigger pull, if you do a long trigger pull, it's no biggie. You'll just wait longer for the rotating head to slow down and get to the thudding click auto line feed noise. Manual feed - I used it when I broke one of two of the cutting lines in the spool itself. 1. Unplug your extension cord 2. Set the weedwacker on its handle. 3. Press the protruding single, rectangular red button on the rotating head while at the same time pull the cutting line that's short. 4. Release the red button 5. Repeat until the cutting line is the length to the cutting blade on the shield. Cutting line broke in the spool 1. Push the two grip-corrugated red tabs that are 180-degrees from each other on the rotating head with your thumb and middle finger and pull straight up. 2. Then lift the spool out 3. Hold both windings of cutting line with your thumb, vertically, against the spool so that all your line won't come unspooled. This happened to me until I figured out the vertical thumb trick. 4. Pull the end of the broken cutting line out. 5. Thread the cutting line through the metal eye of the rotating head. 6. You may need to do the same for the other eye with the other winding, if you needed to pull the spool completely out to find the broken end. 7. Put the spool back in. 8. You may need to rotate the spool a very little bit for the top of the spool to come level with the rotating head. If it's not seated properly, up to 3/16" off, it'll protrude past the rotating head. 9. Put the cap back on using your thumb and middle finger to depress the two grip-corrugated red tabs and snap it back in. Weedwacking Ability - AWESOME!!! Cut through 3/4" weed trunks with no problem! Listen to the sound. If it slows down, slow your cutting motion!
When I brought this trimmer home, I discovered that it used the same wasteful line distribution system as the unit that I had purchased it to replace. Every time you press the trigger the unit advances line. When trimming my fence line, which is over two hundred feet long I don't want to have to hold the trigger for that length of time. To me this is a very poorly designed feature. As expected I immediately returned the unit to Sears for a refund.