In reply to scelestus:
http://www.ukclimbing.com/images/dbpage.php?id=158520
Can't believe someone actually rated this photo, but a 3 ain't bad considering it's a terrible pick.
If you build one with limited height, definately make it 45 degrees.
Don't use it as much as I should, quite hard to self motivate, but it's definately good to have.
M