Link to Gogo Cartomizer
http://www.e-cigarette-forum.com/forum/ego-type-models/188388-how-clean-rebuild-gogo-cartomizer.html
Doing an experiment I stumbled on a very easy way of cleaning a 808/901 DC Echo carto. I used a blunt tipped punch with a very thin shaft just long enough to get between the packing and the wall to the threaded end inside the shell. Holding the carto firmly in my hand I tapped gently on the punch and to my surprise the guts popped right out after a few taps. Once the guts are in the open the cleaning is a breeze just like your instruction illustrate. Once cleaned and replaced on the air tube per your instructions it's a simple task to insert it into the shell, place the threaded end on a firm surface, place a small piece of wood squarely on the mouthpiece end of the tube making sure everything is aligned and vertical and gently tap it into place.
About the most difficult part was getting the punch shaft between the packing and the wall without snagging the packing. I only had the one carto to experiment with but when I clean my next one I'll find a smooth surfaced nail a little longer than the carto to punch the threaded end out of the shell. Probably be a good idea to punch it out from opposite sides a little at a time to get it out evenly though mine came out by punching on the one side it bent the center air tube a little due to it being wedged against the wall from punching it out from one side.
Wish I had more to experiment with but perhaps some folks here with retired 808/901 Echo carts will see if my ease of getting the guts out was a fluke or if it works for them as easily as it did for me.
FWIW, unlike my last effort at taking an Echo apart and cleaning it, this time the result were to bring the carto back to like new condition. Unlike my last attempt where one coil was weak these were both bright red during the dry burn and the end result was well worth the effort.