[EdZ]

Thought I would add my response to a similar thread on Brian's site re: sweetspot and hosel rotation

Take a club and hold it in your thumb and forefinger at the very end of the grip.

Spin it around (or better, imagine you could spin it fast)

(as noted by shootin4par on Brian's site, you can hold it between your palms to do this)

Notice that because of the design of the club, the clubhead spinning in this way travels in a 'circle' - from the tip of the grip end where you are holding it - to the 'center' of the circle create when you spin the club in this way.

The 'center' of that circle is, in effect, the sweetspot

Now - imagine this same picture - but in a horizontal plane....

then in a golf motion....

The hosel (or if it helps to picture it, the shaft) rotates around that 'circle'