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This combo allows you to unscrew/screw the two 7/64th socket head bolts on the extruder.

[img]http://i.imgur.com/9nRINXo.jpg[/img]

[youtube]http://www.youtube.com/watch?v=ip_sVs_DaSs[/youtube]

Tools required:

7/64th hex/allen bit
http://www.harborfreight.com/33-piece-s ... 68459.html
or
http://www.harborfreight.com/100-piece- ... 68457.html

Electric Screw driver
http://www.harborfreight.com/48-volt-co ... 68394.html

I could be doing this wrong but I haven't taken my extruder apart for filament changes. I just retract until the filament is completely out. Then I feed the new filament in. Only need to adjust the tension if I see a significant difference in filament diameter. I know others have had issues with the filament kinking between the feed rollers and the bowden fitting but I haven't had a problem yet.

BTW; I do the retract while the head is hot so the filament separates from the nozzle.