Here is the instruction manual direct from Black & Decker for the GH1000 XP model. You may or may not have the twin string head, but all instruction manuals are available from their site. As close as I can figure, this pertains to your model.
http://servicenet.blackanddecker.com/documents/English/Instruction%20Manual/90556296,GH1000.pdf
You will need Adobe Reader installed on your computer to view this as it is a PDF. If you don't, go to Adobe's website. The download for it is safe and free..and easy to delete afterwards if unwanted.
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