I had the same problem myself, today! Took me a while to work it out! And it's hard to explain, so I've put a URL below that will take you to a 'photo of the correctly fitted spring on my Facebook page.
http://www.facebook.com/photo.php?fbid=207230829325414&set=a.207230699325427.56512.100001154953120&type=1&theater
boosimulacrum, July 2011