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How do I remove the locking ring on my Black and Decker GL560 Strimmer?

I need to remove the locking ring on my Black and Decker GL560 Strimmer. This is to allow access to the switch in the upper half of the strimmer. So far I have not been able to work out how this locking ring is removed and would welcome any help to achieve this .
Geoff Barnes, April 2014