[O.B.Left]

Nice drawings.

But I dont get the sweet spot not traveling with the clubheads travel.

Travel is dependent on Hinge Type but only via the #3 Accumulator angle, the angle at the left arm and club when seen from DTL. The more angle the more travel. You can zero out #3 by going in line like we do when putting say with less send resulting. In this case the travel associated with all Hinge Actions would be the same.

But, Im thinking that if the clubhead travels so does the sweet spot, no? Although sometimes I do feel like Ive left my sweet spot behind, some place.