[neil]

Yes Neil. Offset does put the sweet spot out of line with the shaft but what we are really interested in is the sweet spot plane not the shaft plane. The sweet spot plane is derived from the #3 ppt to the sweet spot of the club head. Therefore you should be able to swing any club head design with a little practice. At least that is how I see it.

That makes sense.Does that also explain why increased offset through the set brings consistency?I am interested in the theory promoted by manufacturers of increased offset the lower the number(of iron).But this does not apply to woods -presumably because of the ease of moving CG in woods as compared to irons?: