The new Tommy Armour 845 irons have an adjustable weight built in. Is this a first for irons?
The adjustment is marketed as an adjustment of the sweet-spot of the clubs. For example, if a golfer tends to hit a certain iron towards the toe, he/she would move the weight, and sweetsot there. From what I have read it is not intended as a trajectory correction/adjustment (e.g. anti slice) device.