Published in Crochet! Magazine March/April 2010
The easiest way to join the foundation round is to work your foundation single crochet base (be sure to use this stitch and not a chain with sc worked into it…that won’t be elastic enough and will pucker the fabric). Lay it out flat on a table top or such. Then fold it back along itself, the 2 “ends” are now together.
Flip one end (180 degrees) so the top of the single crochet is at the bottom of the single crochet on the other end. Slip stitch into the bottom of the opposite end, then thread the tail end from the beginning to close the gap. You now have a mobius strip (albeit a very narrow one). As you work the first round the fabric grows on both “sides” of that strip.
In a mobius shape both “sides” are worked at the same time. So ignore the instructions for a 2nd side, the “first side” completes the project.
Also in the “first side” instructions it should say after Round 5 to (repeat Rounds 4 & 5) 3 times then one more round 4 . Otherwise you do not have the correct set-up for doing the finishing round.
For further explaination of a mobius strip: http://en.wikipedia.org/wiki/M%C3%B6bius_strip