how can i replace the cord on my electric whipper snipper?

I've been scanning the web trying to find an answer to what should be the simplest of problems: trying to see how to replace a trimmer head and/or for a diagram that shows how the assembly should be replaced, but without any success. RYOBI doesn't offer this on the site. I'm OVER IT! I'll buy from a company that actually offers basic support in the future!!

GG
January 2010

INSTRUCTIONS FROM OPERATION MANUAL :
REPLACING THE CUTTING LINE
WARNING: Use of line other than the original monofilament cutting line could cause personal injury or damage to the trimmer.
Follow these steps to replace the cutting line.
• Release the trigger and allow the trimmer to coast to a stop.
• Unplug the trimmer.
WARNING: Make sure the trimmer head stops rotatating when you release the trigger. Contact with a rotating trimmer head could cause personal injury.
Remove the bump knob by turning it counterclockwise,
Remove the empty spool.
Clean the trimmer head thoroughly. Inspect the trimmer head for any damaged or worn parts.
Cut two pieces of line approximately 2.7 m long.
Insert the end of the new line into the hole in the upper threaded area of the spool.
Wind the line counterclockwise around the spool following arrows on spool. Do not overfill.
NOTE: After winding the line, there should be about 152 mm between the wound line and the outside edge of the spool.
Secure the line temporarily by pushing it into one of the slotted tabs on the spool.
Repeat the process for the lower threaded area of the spool, winding the line clockwise and securing it in the slotted tab opposite the first secured line.
Insert the lines into the eyelets in the trimmer head. Place the spool on the drive shaft.
NOTE: To install the spool, you may need to rotate it slightly.
NOTE: If the line should tangle or break at the eyelets, remove the spool, refeed the line through the eyelets and reassemble the spool on the trimmer.
Release the lines from the tabs by sharply pulling each line while pushing down on the spool.
Push down on the spool to reveal the threads on the drive shaft.
Place bump knob on the threads inside the drive shaft.
Secure the bump knob by turning it clockwise.
WARNING:
An improperly installed bump knob or spool could fly off the trimmer. Contact with a thrown bump knob or spool could cause personal injury.

KAYBEE
February 2008