( vote for me on feb 2nd onwards, i want a solar bag! )
Step 1: What you need!
Scalpel or Craft knife - To separate the neck and body, (scissors really don't work here)
Scissors (smaller the better) - To cut the feathers, (craft knife really doesn't work here)
Masking tape - To pad the shuttle's base
Fingers etc - to handle all above
Step 2: Make a template thingy around the bottle.
Step 3: Cut it down to about 6cm from the bottle.
Its best to cut the base of the bottle 6cm from the bottle first with the craft knife, then cut the feathers with scissors.
Step 4: Start cutting the feathers.
Step 5: Add padding.
Then cut the bit that sticks out every 5mm or so, and push all the "teeth down"
Then completely cover it with more tape, making sure its as even as possible.
Step 6: Finished!
Video - http://uk.youtube.com/watch?v=QlEurgoIECA
Its very noisy and not super accurate, but it works and travels quite far.