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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.
They have upgraded the old string heads (type 1) to a new string head (type 2). They say type 1 is no longer available. Please see part numbers 20 & 21 in this 14" Grass Hog parts breakdown diagram. The new string head is relatively inexpensive. If you don't want to get one, could I suggest you take the old spring (if you have it) and match it up with possibly a new spring at the hardware store. Sometimes you get lucky! Here is the parts diagram for it. Hope this helps! http://www.ereplacementparts.com/black-and-decker-gh1000-type-grass-hog-trimmeredger-parts-c-4167_9518_9532.html
I found this solution on the net. I hope it helps.
Unscrew cap and remove. Remove line guide ring. Note which way to put
line guide ring back on, slot to outer edge. Remove the empty spool.
Don't take spool apart unless you need to get inside to remove string.
The outer half should be yellow. Cut 25 ft. of .065 line. Start pushing
the line inside the spool from the center making sure the string is
winding inside in a counter clock direction which should be shown on the
spool. Keep pushing until there is about only 6 in. left.
Replace spool. Then the line guide ring, making sure to pull the string
through the middle of it. Then hold the string on the slot in the ring
while replacing the cap.
Hold orange spool containing string while twisting the black plastic cap in the center, counterclockwise. This retaining cap is loosely spring loaded, so watch for the spring falling out. Once this locking cap is removed, the spool pulls right off.
This trimmer is an "AFS" (Automatic Feed System) trimmer meaning the trimmer uses centrifugal force and a lever that play out trimmer line without you ahving to bump it on the ground. Your trimmer uses .080" diamter line. You can get a replacement spool and lever at Lowe's fairly cheap. I would say get the spool that is already wound rather than trying to buy just the line and re-spooling...that will make this a LOT easier!
What you do to replace the line is place the trimmer on a stable flat surface (like a workbench), raise up the head of the trimmer and follow the steps below:
1. Remove the spool cover (this is the orange cap on the head)
2. Remove the spool, (observe and note the orientation of the spool!)
3. Using a pair of pliers, pull the orange feed lever straight out (observe and note the orientation of the lever!)...do not try to pry it off, you will damage the head!
4. Insert the new lever in the same orientation you noted when you removed the old one.
5. Insert the new spool and line in the same orientation as the old spool.
6. Replace the cap.
Black and Decker has an 800 number you can call if you get stuck, the number is 1-800-544-6986. Good Luck!