"I required a new trimmer as my ( ten year ) old motor gasped it's last. Essentially I just needed a new power plant but since it is sold as a set I decided on the TB539 ES. The engine worked fine, however the trimmer head has much to be desired. I had to stop 5 times in 15 minutes because one side of the head would loose the string inside where the other side still had 3 or more inches sticking out. This of course mandated that I take the head apart to fish out the lost string. Although it is supposedly a straight forward process, the physical head dis-assembly / reassembly was much more difficult than it should have been. After the fifth stoppage I felt I had given it enough of a chance and dug out my old attachment and ran through an entire load of string without mishap."
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