Bests & Worsts Reviews from Amazon

I just ordered another GreenWorks 21212 4Amp 13-Inch Corded String Trimmer after three years of hard use on the first one. I live on the edge of the high desert in Oregon and I have been cutting my entire ½ acre property with one of these. This includes wire fences, rock gardens, ironweeds that grow up over a septic leech field. These are great trimmers BUT there are a few things you need to know to make them work right. These are dual sting and the automatic advance will only work properly when you are using both strings. This brings us to the replacement spools sold by various companies which DON’T even fit the trimmer. So forget them and get a 200-300 spool of .065 round (I say round – I have not tried the edged string) string and re-wind the original spool which came with the trimmer. There is an arrow on top of the spool which will let you know in which direction to wind the spool. BOTH strings are wound in the SAME direction. To get the string started in the spool there is a slot in the spool and slip the string in the same direction of the direction you will wind. This locks the string in place and allows you to wind. How to get the trimmer to advance once you have the stings loaded. AUTOMATICALLY – understand that there is no sensor in the trimmer telling it to let out more string. The string is advanced EACH TIME YOU LET OFF THE POWER and the spool is allowed to come to a complete stop. Just before it comes to a stop, you will hear a slight click from the spool. This means that it has reset the advance and when you give it power again, the strings will advance. You can stop and start the trimmer as many times as you like until the stings are where you want them. MANUALLY – you can advance the strings manually by turning the trimmer on its handle and looking at the spool for a little black rectangle button on the spool. Jiggle that and play with the string and the string will advance. This trimmer is 4 amp which means there might be brush or thick weeds which you cannot get through without the motor straining. You can work around this. Go to one single string. BUT be aware the automatic advance will not work properly with only one string. So you will have to manually advance the string. This will reduce the drag on the strings and allow you to cut thru thicker grass and weeds. The cut will not be a neat and you might have to make two passes BUT the motor will probably not bog down.