I learned a trick to keeping the line from breaking... Don't use the trigger. The thing spins fast enough when idling to do the edging (just grass). Whenever I hold the trigger and spin it full speed, within 30 seconds the line is down to an inch or two.
Mine is a gas powered, intended for residential use and the power is total overkill. The only time I'd ever need to use the trigger and put it up to 'normal' speed is if I was cutting a swath through a forest.
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