Open - Opening the face by 2 degs is more for a player who wishes to hit a fade (right hander) or who hits a draw who wants to hit the ball straighter.
Close - closed 2 deg, for players who wish to hit a draw or for players who hit a fade/slice who wish to straighen then drive out.
Nut - for players who hit the ball straight of the tee.
Weights the 10g & 1g weights can be removed and placed in the heel or the toe of the club this also helps with fade & draw shots.
goldeena:To me it's just a lightweight aluminum cap with a screw, it's not weight balanced in any particular direction and the club sits up the same whatever position it's set,
Ah i know what you mean here. Sometimes this cap will get stuck the little screw will turn around to different spots but won`t change the angle of the club. (you think you have it 2 deg closed) but really it is in the last spot you had the club set up sometimes when it gets old just does not turn the little thing in side to get it to the next spot.
Just take the cap of un screw it clean I sometimes spay a littl lynx in the hole acts as a little bit of lube you could say gets things turning there are more stuitable products to use then lynx.
Also 2 deg difference in face on set up is hard to notice.
This youtube video will give you more information
https://www.youtube.com/watch?v=RSCrELVFHec