Are you sure it's a Challenge Extreme brand as the HG500B is listed as a Sovereign model?
They are available either in your local hardware shop, garden centre or ebay just look for FL289 by ALM Manufacturing 01423 797208
or go to
Homebase (ref 715773)
FOCUS (ref 207190)
B&Q (ref 03198803)
Richard
April 2010
hg500b
Theresa Meau
April 2010
What model?
Richard
April 2010
Automatic Answer
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