Felt TT Dual Position Seatpost. How does it work?

velo.2010
velo.2010 Posts: 48
edited January 2013 in Workshop
Hello.

Recently picked up a Felt B16 TT bike. I'm wondering though how the Dual position seatpost works. Didn't get any instructions and the website doesn't offer any help. Plus I can't get to the bikeshop at the moment.

The current Tri set-up has the saddle way over the bottom bracket. Its probably blindingly obvious how it works but I don't want to damage anything. Anyone with experience of Felt TT bikes or who can direct me to some online help would be appreciated!

Cheers.