Stuart is right again...
Nobody here can actually see your broken ironing board but here's some rocket science...
Put it on a fable face down and extend the legs to the normal ironing position - it is now an upside down ironing board. Apply some pressure to the feet - have a friend help you if necessary and closely observe the mechanism moving - try to work out what is happening that shouldn't be happening or conversley - what is not happening that should be happening.
When you have worked it out you will be in a better position to fix it.
Good luck...
Peccavi
November 2008