I learned it the hard way...... The boat was missing both the mast post pad and the compression tube. Wish I had a better assembly manual from Nacra to show EXACTLY what should be part of the boat and how to tune it.
I still can't believe the little pad is $ 25 though.
Thanks and good luck with your boat,
Greg

The nice part about being a pessimist is that you are constantly being either proven right or pleasantly surprised. - George Will
"It's not that liberals aren't smart, it's just that so much of what they know isn't so" -Ronald Reagan