"Me here" wrote:
snip
15 years in plant and golf course maintenance taught me it's usually the
operator being a little *too* aggressive which causes the line problems
especially with the crap line supplied with the DIY machines.
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My strimmer line was also crap, lasting for only two 'gentle' strims. The
plastic line was not even strong enough for cutting grass, which it should
have been. I am now experimenting with stronger plastic tape, the sort
used for packaging. I have still to find a successful way of feeding it in
the reel and out through the line holes.

MikeCT