The Natural Philosopher formulated the question :
I had a crappy flymo electric. Did this all the time. Now I have a petrol one
with a much better head. No sharp edges where the cord exits. I wind the
spool myself with heavy duty nylon. Jus bump it a few times when its
obviously a bit low on cut.

Never ever had the cord snap off completely, nor weld.

Mine has two metal sleeves (furrals) where the two lines exit. I don't
think I have come across having the line weld, though it has jammed up
inside due to knots. I think there must be some technique, which I have
yet to find, to avoid the line breaking off inside the head.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk