How do I replace the cord in my strimmer?

The cord ran out in my grass strimmer (McCulloch TrimMac 250) but I can't seem to unscrew anything to get the line in... Any answers?
Stewart, May 2005


done
You have got a big nut on the back of the trimmer head hold this with a spanner them hold the black head cap with a pair of
ajustable grips ant turn as normal the head just gets tight with use.

Glen Coombes, May 2005
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