How do you get the trimmer line assembly off the stihl fs 90r trimmer in order to replace it with the brush cutting blade?
If you bought the trimmer new there should be a rod about 6" long and 1/8" thick. Above the trimmer head below the trimmer gearbox there is a hole. You have to put the rod in that hole and turn the head until that locks it from turning.
From there you can screw the trimmer head off by hand, or a strap wrench if it's really tight. It may be left hand threads.
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