A lot of people seem to have problems with this, and I made a video tutorial showing you how to do it, for this pattern
http://www.youtube.com/watch?v=i6hABWj-iJ4
For the other strap, which might give you headaches as well, I also made a video.
http://www.youtube.com/watch?v=wLIysAH-HdM
I hope that helps.
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The ways of Yarn are inscrutable.
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